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Return an error if metric cannot be registered

**What this PR does / why we need it**:

`prometheus.MustRegister` panics if a metric cannot be registered. This PR replaces it with `prometheus.Register`, as it does not panic, and returns the error if the metric cannot be registered.

I also adds lacking tests for `RegisterMetricAndTrackRateLimiterUsage`.

**Which issue this PR fixes**:

Fixes #52872

**Special notes for your reviewer**:

None of the `metrics.RegisterMetricAndTrackRateLimiterUsage` invocations check the returned error, so I plan to submit new PRs to address this.

**Release note**:

```release-note
NONE
```
/sig instrumentation

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revamp replicaset integration tests

**What this PR does / why we need it**:
This PR revamps existing replicaset integration tests. Some unit tests have been converted to integration tests.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #51484

**Release note**:

```release-note
NONE
```

**TODO List**:
- [x] add an integration test to verify scale endpoint works
- [ ] convert testReplicaSetConditionCheck() to integration test, and modify the test as replicaset's condition has been removed
- [ ] ~~HPA-related replicaset integration test (may be better suited under HPA integration tests)~~
- [x] verify all tests from "Suggested unit tests to retain" list of the internal doc will not be converted to integration tests, or convert the tests accordingly
- [ ] ~~refactor sync call tree (refer deployment and daemonset PRs)~~
- [x] further improve written integration tests (revise test strategies, remove redundant GET / UPDATE calls, add more relevant sub-tests)
- [x] remove unit tests that have overlapping testing goals with written integration tests

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Don't skip mounts if we can't find the volume

**What this PR does / why we need it**:
Return an error instead of skipping the volume while constructing the list of volume mounts for the container runtime.  This prevents the scenario of a container writing data to an ephemeral volume when it expects the volume to be persistent.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #53421

**Release note**:

NONE

@kubernetes/sig-storage-pr-reviews

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[GCE] Bump GLBC to 0.9.7

Updating GLBC to the latest version

```release-note
GCE: Bump GLBC version to [0.9.7](https://github.com/kubernetes/ingress/releases/tag/0.9.7).
```

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revamp replicaset e2e tests

**What this PR does / why we need it**:
This PR removes some replicaset e2e tests as they will be converted to integration tests:
(1) condition check test
(2) pod adoption test
(3) pod release(orphaning) test

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: xref #52118

**Release note**:

```release-note
NONE
```

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Fix a bad cut/paste of a node label.

Fixes concerns [raised](https://github.com/kubernetes/kubernetes/pull/53146#pullrequestreview-66541495) in #53146

@mikedanese @jdumars

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fix annoying leader election typo

Small typo that annoyed me. It expected `configmaps`

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query --incompatible_comprehension_variables_do_not_leak=false

Also set this flag for `bazel query`

See #52677

```release-note
NONE
```

/assign ixdy

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Do not set auto-detect cloud provider as the default in kubelet

**What this PR does / why we need it**:

This is part of the move to external cloud providers. Please see
plan detail in issue 50986. This PR covers step 2:
 v1.9 - set no cloud provider as the default in kubelet but still allow
 opt in for auto-detect

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
Fixes: https://github.com/kubernetes/kubernetes/issues/50986

**Special notes for your reviewer**:

**Release note**:

```release-note
kubelet's `--cloud-provider` flag no longer defaults to "auto-detect".  If you want cloud-provider support in kubelet, you must set a specific cloud-provider explicitly.
```

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Return err when delete volume failed

Return err when delete volume failed

**Release note**:
```release-note
NONE
```

/kind bug
/sig openstack

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In DevicePluginHandlerImpl.Allocate(), skips untracked extended resou…

…rces.

Otherwise, we would fail a Pod allocation request that has an extended
resource not managed by any device plugin.



**What this PR does / why we need it**:

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
https://github.com/kubernetes/kubernetes/issues/53548

**Special notes for your reviewer**:

**Release note**:

```release-note
Ignore extended resources that are not registered with kubelet
```

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Use const instead of hard code for volume plugin

**What this PR does / why we need it**:
nits: cleanup hard-coded volume plugin name

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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Refactor network policy e2e tests, and add additional logging when tests fail

**What this PR does / why we need it**:
- Restructure tests, clean up duplicate code
- Add additional logging, so it's easier to debug when the tests fail
- Add retry on the client side pods because sometimes kubelet will start the pod when the network is not ready, resulting in flaky tests
- Add readiness probe for the server pods to further reduce the flakiness.

Current failure messages when a test fails:
```
checking client-can-connect could communicate with server.
  Expected error:
      <*errors.errorString | 0xc420868820>: {
          s: "pod \"client-can-connect\" failed with status: {Phase:Failed Conditions:[{Type:Initialized Status:True LastProbeTime:0001-01-01 00:00:00 +0000 UTC LastTransitionTime:2017-07-25 15:54:48 -0700 PDT Reason: Message:} {Type:Ready Status:False LastProbeTime:0001-01-01 00:00:00 +0000 UTC LastTransitionTime:2017-07-25 15:54:57 -0700 PDT Reason:ContainersNotReady Message:containers with unready status: [client-can-connect-container]} {Type:PodScheduled Status:True LastProbeTime:0001-01-01 00:00:00 +0000 UTC LastTransitionTime:2017-07-25 15:54:48 -0700 PDT Reason: Message:}] Message: Reason: HostIP:10.138.0.2 PodIP:10.60.1.180 StartTime:2017-07-25 15:54:48 -0700 PDT InitContainerStatuses:[] ContainerStatuses:[{Name:client-can-connect-container State:{Waiting:nil Running:nil Terminated:&ContainerStateTerminated{ExitCode:1,Signal:0,Reason:Error,Message:,StartedAt:2017-07-25 15:54:49 -0700 PDT,FinishedAt:2017-07-25 15:54:57 -0700 PDT,ContainerID:docker://c91c33139672c20a5231bcba9437d74e12d35a6d19275b41bb8e571148b4ab57,}} LastTerminationState:{Waiting:nil Running:nil Terminated:nil} Ready:false RestartCount:0 Image:gcr.io/google_containers/redis:e2e ImageID:docker://sha256:e5e67996c442f903cda78dd983ea6e94bb4e542950fd2eba666b44cbd303df42 ContainerID:docker://c91c33139672c20a5231bcba9437d74e12d35a6d19275b41bb8e571148b4ab57}] QOSClass:BestEffort}",
      }
      pod "client-can-connect" failed with status: {Phase:Failed Conditions:[{Type:Initialized Status:True LastProbeTime:0001-01-01 00:00:00 +0000 UTC LastTransitionTime:2017-07-25 15:54:48 -0700 PDT Reason: Message:} {Type:Ready Status:False LastProbeTime:0001-01-01 00:00:00 +0000 UTC LastTransitionTime:2017-07-25 15:54:57 -0700 PDT Reason:ContainersNotReady Message:containers with unready status: [client-can-connect-container]} {Type:PodScheduled Status:True LastProbeTime:0001-01-01 00:00:00 +0000 UTC LastTransitionTime:2017-07-25 15:54:48 -0700 PDT Reason: Message:}] Message: Reason: HostIP:10.138.0.2 PodIP:10.60.1.180 StartTime:2017-07-25 15:54:48 -0700 PDT InitContainerStatuses:[] ContainerStatuses:[{Name:client-can-connect-container State:{Waiting:nil Running:nil Terminated:&ContainerStateTerminated{ExitCode:1,Signal:0,Reason:Error,Message:,StartedAt:2017-07-25 15:54:49 -0700 PDT,FinishedAt:2017-07-25 15:54:57 -0700 PDT,ContainerID:docker://c91c33139672c20a5231bcba9437d74e12d35a6d19275b41bb8e571148b4ab57,}} LastTerminationState:{Waiting:nil Running:nil Terminated:nil} Ready:false RestartCount:0 Image:gcr.io/google_containers/redis:e2e ImageID:docker://sha256:e5e67996c442f903cda78dd983ea6e94bb4e542950fd2eba666b44cbd303df42 ContainerID:docker://c91c33139672c20a5231bcba9437d74e12d35a6d19275b41bb8e571148b4ab57}] QOSClass:BestEffort}
  not to have occurred
```

Failure message with this PR:
```
 should support a 'default-deny' policy [Feature:NetworkPolicy] [It]
    /Users/gunjan/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/test/e2e/network/network_policy.go:81

    Jul 25 14:35:55.978: Pod client-cannot-connect should be able to connect to service svc-server, but was not able to connect.
    Pod logs:
    Connecting to svc-server.e2e-tests-network-policy-tbzm8:80 (10.63.254.124:80)
    wget: download timed out
    Connecting to svc-server.e2e-tests-network-policy-tbzm8:80 (10.63.254.124:80)
    wget: download timed out
    Connecting to svc-server.e2e-tests-network-policy-tbzm8:80 (10.63.254.124:80)
    wget: download timed out
    Connecting to svc-server.e2e-tests-network-policy-tbzm8:80 (10.63.254.124:80)
    wget: download timed out
    Connecting to svc-server.e2e-tests-network-policy-tbzm8:80 (10.63.254.124:80)
    wget: download timed out


   Current NetworkPolicies:
    	[{{ } {deny-all  e2e-tests-network-policy-tbzm8 /apis/networking.k8s.io/v1/namespaces/e2e-tests-network-policy-tbzm8/networkpolicies/deny-all 20fa92ab-7181-11e7-855b-42010a8a0003 87694 1 2017-07-25 14:35:07 -0700 PDT <nil> <nil> map[] map[] [] nil [] } {{map[] []} []}}]

   Pods:
    	[Pod: server, Status: &PodStatus{Phase:Running,Conditions:[{Initialized True 0001-01-01 00:00:00 +0000 UTC 2017-07-25 14:34:52 -0700 PDT  } {Ready True 0001-01-01 00:00:00 +0000 UTC 2017-07-25 14:35:00 -0700 PDT  } {PodScheduled True 0001-01-01 00:00:00 +0000 UTC 2017-07-25 14:34:52 -0700 PDT  }],Message:,Reason:,HostIP:10.138.0.2,PodIP:10.60.1.145,StartTime:2017-07-25 14:34:52 -0700 PDT,ContainerStatuses:[{server-container-80 {nil ContainerStateRunning{StartedAt:2017-07-25 14:34:53 -0700 PDT,} nil} {nil nil nil} true 0 gcr.io/google_containers/porter:4524579c docker://sha256:711ccbc1c74f3417f2a0f403c194017b3bde09eec3c3b42dc9c838db3894c223 docker://3fa73da57380ef28520f8bbf53b3540f523ab76d45a1b42cc9a1e4573eb45639}],QOSClass:BestEffort,InitContainerStatuses:[],}
     Pod: server, Status: &PodStatus{Phase:Running,Conditions:[{Initialized True 0001-01-01 00:00:00 +0000 UTC 2017-07-25 14:34:52 -0700 PDT  } {Ready True 0001-01-01 00:00:00 +0000 UTC 2017-07-25 14:35:00 -0700 PDT  } {PodScheduled True 0001-01-01 00:00:00 +0000 UTC 2017-07-25 14:34:52 -0700 PDT  }],Message:,Reason:,HostIP:10.138.0.2,PodIP:10.60.1.145,StartTime:2017-07-25 14:34:52 -0700 PDT,ContainerStatuses:[{server-container-80 {nil ContainerStateRunning{StartedAt:2017-07-25 14:34:53 -0700 PDT,} nil} {nil nil nil} true 0 gcr.io/google_containers/porter:4524579c docker://sha256:711ccbc1c74f3417f2a0f403c194017b3bde09eec3c3b42dc9c838db3894c223 docker://3fa73da57380ef28520f8bbf53b3540f523ab76d45a1b42cc9a1e4573eb45639}],QOSClass:BestEffort,InitContainerStatuses:[],}
    ]
```
**Release note**:

```release-note
NONE
```

Automatic merge from submit-queue (batch tested with PRs 53567, 53197, 52944, 49593). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Clean up in `cluster_size_autoscaling.go`

**What this PR does / why we need it**:

Fix `golint` errors.

**Release note**:
```release-note
NONE
```

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[OpenStack]Add codes to check the count of nodes(members)

After merging this PR(#53146), if there is no available nodes for
the loadbalancer service, UpdateLoadBalancer() will run panic.

**Release note**:
```release-note
NONE
```

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Address code-gen issue 7 nil pointer when incorrect pkg name

**What this PR does / why we need it**:
When using the code-gen tool, if the comments in the ```doc.go``` file has a misspelled pkg name, it ends with a nil pointer. This can be difficult to debug. This PR fixes that by logging an error and continuing. 
https://github.com/kubernetes/code-generator/issues/7

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:
I was not sure whether just exiting here would be correct behaviour as reading the code , I noticed in other places it continues if the pkg is nil.
Also perhaps I should use the ```glog.V(5).info```  ?

```release-note
`NONE`
```

Also set this flag for `bazel query`

See #52677

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apiextensions: add round trip tests for CRD schema conversion

Follow up test for https://github.com/kubernetes/kubernetes/pull/52281.

Need to update go-openapi to get this - https://github.com/go-openapi/spec/pull/31 - in.

**Special notes for your reviewer**: The tests won't pass until https://github.com/kubernetes/kubernetes/pull/52281 is merged.

**Release note**:

```release-note
NONE
```

/cc @sttts

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add possibility to ignore volume label in dynamic provisioning

**What this PR does / why we need it**: this is needed if openstack cinder zone name does not match to compute zone names. For instance if there is only one cinder zone and many compute zones.

**Which issue this PR fixes**: fixes #53488

**Special notes for your reviewer**: 

```release-note
NONE
```

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Improve `horizontal.go` documentation

**What this PR does / why we need it**:

Resolve the remaining `golint` errors in the
`pkg/controller/podautoscaler` package by improving the documentation
in `horizontal.go`. Now all public methods have comments.

**Special notes for your reviewer**:
Re discussions in [this pr](https://github.com/kubernetes/kubernetes/pull/52238).

**Release note**:
```release-note
NONE
```

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Add launching Cluster Autoscaler in Kubemark

**What this PR does / why we need it**:
Allows to launch Cluster Autoscaler in Kubemark. 
To do it, set ENABLE_KUBEMARK_CLUSTER_AUTOSCALER flag to true. This currently only works with one nodegroup, for which you can specify minimum and maximum number of nodes and name. (KUBEMARK_AUTOSCALER_MIN_NODES, KUBEMARK_AUTOSCALER_MAX_NODES, KUBEMARK_AUTOSCALER_MIG_NAME).
Is is important to note that NUM_NODES has a different meaning when launching Cluster Autoscaler - we always start with only one node, but NUM_NODES is used to calculate the size of Kubemark master and addon components.

There are no changes to the current setup if ENABLE_KUBEMARK_CLUSTER_AUTOSCALER is set to false.

**Release note**:
```
NONE
```

Fix `golint` errors in `cluster_size_autoscaling.go`.

This is part of the move to external cloud providers. Please see
plan detail in issue 50986. This PR covers step #2:
 v1.9 - set no cloud provider as the default in kubelet but still allow
 opt in for auto-detect

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Fix the defaultServerImage name of hyperkube in kubefed

**What this PR does / why we need it**:
Fixes the issue mentioned in https://github.com/kubernetes/kubernetes/issues/53430

Docker images cannot contain special characters like '+' in the tags. So while uploading the federation container images we replace '+' character by '_'. This should have been taken care by kubefed too while consuming the federation container image.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #53430

**Special notes for your reviewer**:
This PR fixes the "invalid reference format" issue for the docker image. But am not sure if the version of hyperkube image is available in registry. The version is got from `version.Get()`. So if a user has built the kubefed from source it may be possible that the hyperkube version referenced by that commit is not available in registry. Ideally this issue should not arise on released versions of kubefed.

We need to cherry-pick this fix to all previous supported k8s versions too.

**Release note**:
```release-note
NONE
```

/cc @kubernetes/sig-multicluster-bugs

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Avoid unnecessary gcloud call if test was skipped

This adds a safeguard to AfterEach to avoid attempting to resize node group with empty name when the test was skipped.

```
1009 04:06:31.866] [BeforeEach] [sig-autoscaling] Autoscaling a service
I1009 04:06:31.866]   /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/test/e2e/autoscaling/autoscaling_timer.go:42
I1009 04:06:31.869] [BeforeEach] from 1 pod and 3 nodes to 8 pods and >=4 nodes
I1009 04:06:31.869]   /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/test/e2e/autoscaling/autoscaling_timer.go:68
I1009 04:06:31.869] Oct  9 04:06:31.869: INFO: test expects 1 node group, found 2
I1009 04:06:31.870] [AfterEach] from 1 pod and 3 nodes to 8 pods and >=4 nodes
I1009 04:06:31.870]   /go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/test/e2e/autoscaling/autoscaling_timer.go:74
I1009 04:06:31.870] Oct  9 04:06:31.869: INFO: Skipping dumping logs from cluster
I1009 04:06:32.510] Oct  9 04:06:32.509: INFO: Failed to resize node instance group: ERROR: (gcloud.compute.instance-groups.managed.resize) could not parse resource []
I1009 04:06:32.510] 
I1009 04:06:32.510] Oct  9 04:06:32.509: INFO: Skipping dumping logs from cluster
I1009 04:06:32.510] Oct  9 04:06:32.509: INFO: Unexpected error occurred: exit status 1
```

`prometheus.MustRegister` panics if the metric cannot be registered.
Instead, use `prometheus.Register` and return the error if the metric
cannot be registered.

Also, add tests for `RegisterMetricAndTrackRateLimiterUsage`.
Signed-off-by: Ferran Rodenas <frodenas@gmail.com>

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validate kube-proxy options
Signed-off-by: allencloud <allen.sun@daocloud.io>



**What this PR does / why we need it**:

I found that some components does not validate the config at the startup of itself. Without this, startup will bring some bad things. And I think fail fast can save customer's time and make thing simple and clear.

This PR add validation of kube-proxy's configuration.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

fixes https://github.com/kubernetes/kubernetes/issues/53578

**Special notes for your reviewer**:

Actually I only add a file named validation.go in `pkg/apis/componentconfig/validation/`, while I see in every folder, there is a file named `BUILD`, I hope to know how to add this file.
 
**Release note**:

```release-note
NONE
```

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apiextensions/examples: remove unnecessary function

**What this PR does / why we need it**:

The `BuildConfigFromFlags` function already calls the `InClusterConfig` function.

**Special notes for your reviewer**:

If this function was added to bypass [the warning](https://github.com/kubernetes/client-go/blob/master/tools/clientcmd/client_config.go#L529), then maybe we should instead add a comment.

/cc @sttts @nikhita

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[e2e] add service session affinity test case

**What this PR does / why we need it**:

**Which issue this PR fixes**: 

Add service session affinity test case for e2e

fixes #31712

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

ignorelabel -> addlabel

FIX tests

small fix to test

fixes according what was asked

fix test

fix test

Automatic merge from submit-queue (batch tested with PRs 51771, 52971). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

pass labelSelector to server side opaquely

**What this PR does / why we need it**:
From @smarterclayton 
> The server is responsible for handling label selection for the most part. There is some level of client side processing possible, but for the most part `label selector` should be able to be passed opaquely.

xref #50140

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:
/assign @smarterclayton @liggitt 

**Release note**:

```release-note
None
```

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Refactor nsenter

**What this PR does / why we need it**:

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #51273

**Special notes for your reviewer**:
/assign @jsafrane 

**Release note**:

```release-note
None
```