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kubeadm 710 Switch to a dedicated CA for kubeadm etcd identities

**What this PR does / why we need it**:
On `kubeadm init`/`kubeadm upgrade`, this PR generates an etcd specific CA for signing the following certs:
- etcd serving cert
- etcd peer cert
- apiserver etcd client cert

These certs were previously signed by the kubernetes CA.
The etcd static pod in `local.go` has also been updated to only mount the `/etcd` subdir of `cfg.CertificatesDir`.

New phase command:
```
kubeadm alpha phase certs etcd-ca
```

See the linked issue for details on why this change is an important security feature.

**Which issue(s) this PR fixes**
Fixes https://github.com/kubernetes/kubeadm/issues/710

**Special notes for your reviewer**:

#### on the master
this should still fail:
```bash
curl localhost:2379/v2/keys  # no output
curl --cacert /etc/kubernetes/pki/etcd/ca.crt https://localhost:2379/v2/keys  # handshake error
```
this should now fail: (previously would succeed)
```
cd /etc/kubernetes/pki
curl --cacert etcd/ca.crt --cert apiserver-kubelet-client.crt --key apiserver-kubelet-client.key https://localhost:2379/v2/keys
  # curl: (35) error:14094412:SSL routines:ssl3_read_bytes:sslv3 alert bad certificate
```
this should still succeed:
```
cd /etc/kubernetes/pki
curl --cacert etcd/ca.crt --cert apiserver-etcd-client.crt --key apiserver-etcd-client.key https://localhost:2379/v2/keys
```

**Release note**:
```release-note
On cluster provision or upgrade, kubeadm generates an etcd specific CA for all etcd related certificates.
```

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Temporary fix for LeaderElect for kube-scheduler

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

kube-controller-manager defaults --leader-elect to true. We should
do the same for kube-scheduler. kube-scheduler used to have this
set to true, but it got lost during refactoring:

efb2bb71

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #59729

**Special notes for your reviewer**:

**Release note**:

```release-note
kube-scheduler: restores default leader election behavior. leader-elect command line parameter should "true"
```

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Remove spxtr from various OWNERS files.

I don't have the time to review PRs quickly anymore.

```release-note
NONE
```

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Document k8s.gcr.io/etcd image upgrade/downgrade support

Fixes https://github.com/kubernetes/kubernetes/issues/59221

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 client-go: add an exec-based client auth provider

Updates https://github.com/kubernetes/features/issues/541
Implements https://github.com/kubernetes/community/pull/1503
Closes https://github.com/kubernetes/kubernetes/issues/57164

```release-note
client-go: alpha support for exec-based credential providers
```

/sig auth
/kind feature

I don't have the time to review PRs quickly anymore.

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add unit test case for nodenames comparison

**What this PR does / why we need it**:
ref https://github.com/kubernetes/kubernetes/pull/60486

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

**Special notes for your reviewer**:
please merge it after https://github.com/kubernetes/kubernetes/pull/60486

**Release note**:

```release-note
NONE
```

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Enable IPVS feature gateway by default since it's already beta

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

Per #60501, kubeadm init doesn't support the --feature-gates=SupportIPVSProxyMode=true flag anymore since IPVS is in beta and not alpha anymore. We should enable IPVS feature gateway by default to make kubeadm set up IPVS proxy properly.

**Which issue(s) this PR fixes**:
Fixes #60543

**Special notes for your reviewer**:

**Release note**:

```release-note
Enable IPVS feature gateway by default
```

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dockershim: Return Labels as Info in ImageStatus.

c6ddc749 added an Info field to
ImageStatusResponse when Verbose is true. This makes the image's
Labels available in that field, rather than unconditionally returning
an empty map.

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

This PR exposes an image's `Labels` through the CRI. In particular, I want this so I can write an `ImageService` wrapper that delegates all operations to a real `ImageService` but also, when the right `Labels`, ensures any needed [nix store](https://nixos.org/nix/) paths are present on the system when an image is pulled, enabling users to use nix for package distribution while still using containers for isolation and kubernetes for orchestration. In general, though, this should be useful for anything that wants to know about an image's `Labels`

**Special notes for your reviewer**:

I'd prefer to put this change into the `Image` protobuf type instead of putting it into `Info` (gated by `Verbose` or not, available in other requests like `ListImages` or not), but that would be a change to the protocol and it seems `Info` was introduced exactly for this purpose. If it's acceptable to put this into `Image`, I'll rework this.

If this change is acceptable, I will also do the work for `cri-o`, `rktlet`, `frakti`, and `cri-containerd` where applicable.

I have started the process for my employer to sign on to the CLA. I don't have reason to expect it to take long, but because there is more work to do if this change is desired I'd prefer if we can start review before that is completed.

**Release note**:

```release-note
dockershim now makes an Image's Labels available in the Info field of ImageStatusResponse
```

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Changing Flexvolume plugin directory on COS in GCE to a durable directory

**What this PR does / why we need it**: The original `/etc/srv/...` directory is in an overlayfs over a path in /tmp, so Flexvolume drivers are erased across node restarts for any reason. Changing it to non-tmpfs location.

Also removing redundant Flexvolume path injection in `config-test.sh` because it's already in `cluster/common.sh`.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #57353

**Release note**:

```release-note
[action required] Default Flexvolume plugin directory for COS images on GCE is changed to `/home/kubernetes/flexvolume`.
```

/assign @roberthbailey @saad-ali 
/cc @chakri-nelluri @wongma7 
/sig storage

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fix todo:Move function readinessCheck to util

**What this PR does / why we need it**:
fix todo:Move function readinessCheck to util in test/e2e_node/services
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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E2E: add tests for PSP in the policy API Group

**What this PR does / why we need it**:
E2E tests were added for testing PSP from the "policy" API Group. They are similar to the tests for PSP from the "extensions" API Group.

**Which issue(s) this PR fixes**:
Addressed to: https://github.com/kubernetes/features/issues/5
Follow-up to: https://github.com/kubernetes/kubernetes/pull/54933 and https://github.com/kubernetes/kubernetes/pull/60145

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[e2e ingress-gce] Add test for backside re-encryption

**What this PR does / why we need it**:
Add a basic e2e testcase for ingress backside re-encryption. echoheaders image with HTTPS support was added by https://github.com/kubernetes/ingress-nginx/pull/2091.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #NONE 

**Special notes for your reviewer**:
/assign @nicksardo @rramkumar1 
cc @nikhiljindal 

**Release note**:

```release-note
NONE
```

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sh2ju.sh: suppress `which` command output when gdate not found in $PATH

**What this PR does / why we need it**:
`make quick-verify` (and probably some other commands) doesn't produce a lot of unrelated and useless information to a console now.

Here is the related PR in the upstream: https://github.com/manolo/shell2junit/pull/7

How it was before:
>SUCCESS  verify-pkg-names.sh	1s
>Verifying verify-readonly-packages.sh
>which: no gdate in (/usr/lib64/qt-3.3/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/home/coder/bin:/home/coder/git/bin:/opt/maven/bin:/opt/go1.9.2/bin:/home/coder/.cargo/bin:/home/coder/git/src/github.com/openshift/origin/_output/local/bin/linux/amd64:/home/coder/git/kubernetes/third_party/etcd:/opt/groovy-2.4.12/bin:/home/coder/bin:/home/coder/git/bin:/opt/maven/bin:/opt/go1.9.2/bin:/home/coder/.cargo/bin:/home/coder/git/src/github.com/openshift/origin/_output/local/bin/linux/amd64:/home/coder/git/kubernetes/third_party/etcd:/opt/groovy-2.4.12/bin)

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Refactor reusable parts of scheduler perf test

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

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

**Special notes for your reviewer**:

**Release note**:

```release-note
None
```

/cc @shyamjvs

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Delete the Redundant define tc

**What this PR does / why we need it**:
Delete the Redundant define tc
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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fix nodenames slices comparison para.

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

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

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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Use consts defined in api instead of defining another ones.

**What this PR does / why we need it**:
empty_dir defines some consts. There are already similar consts in api types. So remove the local ones in empty_dir.

**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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Increase failureThresholds for failing HTTP liveness test

**What this PR does / why we need it**:
Removes test from e2e which relies on HTTP liveness as a measure to tell if the container is good or bad. While this is not a bad idea, we cannot rely on this test as HTTP liveness relies on network/infrastructure etc on which sometimes we have no control over. While increasing the timeout may be an option it may not be ideal for all cloud providers/type of hardware etc.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #59150 

**Special notes for your reviewer**:
I have stated reasons in the issue #59150. We have seen that this test is flaking recently in https://github.com/openshift/origin/issues/12072

**Release note**:

```release-note
NONE
```

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Fixed log calls in VolumeManager

Use glog.Infof() instead of glog.Info()

**Release note**:

```release-note
NONE
```


/sig storage
/sig node

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Fix nested volume mounts for read-only API data volumes

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

Since the runtime may try to create mount points within the sandbox, it will fail if the mount point is within a read-only API data volume, like a secret or configMap volume.

Create any needed mount points during volume setup.

**Which issue(s) this PR fixes**:
Fixes #60341

**Special notes for your reviewer**:


**Release note**:

No release note needed since we haven't released any versions with this bug present (yet)

```release-note
NONE

```

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Include connection EOF errors also as retryable errors

Ref https://github.com/kubernetes/kubernetes/issues/55860#issuecomment-368897475

/cc @wojtek-t - Does this SRTY?

```release-note
NONE
```

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remove unused function negotiate() and writeYAML()

**What this PR does / why we need it**:
remove unused function negotiate() and writeYAML() in k8s.io/apiserver/pkg
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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Make Scale() for RC poll-based until #31345 is fixed

Fixes https://github.com/kubernetes/kubernetes/issues/56064
,in the short-term until issue #31345 is fixed.
We should eventually move RS, job, deployment, etc all to watch-based (https://github.com/kubernetes/kubernetes/issues/56071)

/cc @wojtek-t - SGTY?

```release-note
NONE
```

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Adding basic example Flexvolume drivers and DaemonSet deployment example.

**What this PR does / why we need it**: More example Flexvolume drivers as reference for driver authors, and an example driver deployment workflow.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #59148

/sig storage
/assign @chakri-nelluri @zmerlynn 
/cc @wongma7 
/release-note-none

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Add scheduling.k8s.io to the known groups for audit logging on GCE.

This lets PriorityClass objects get logged.

```release-note
NONE
```

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cloud-controller-manager get /healthz to wait for apiserver to be healthy

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

currently cloud-controller-manager use `restclient.ServerAPIVersions()` to wait for apiserver to be healthy.
Remove ServerAPIVersions and make use of /healthz as all other components do.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #60288

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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Update vendored Quobyte API

This update patch includes Quobyte API improvements.
[JSON API fix](https://github.com/quobyte/api/issues/12)
[API Tenant calls](https://github.com/quobyte/api/pull/10)

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fix "make test"

Before this pr, we get this in linux:
```
$ make test
Running tests for APIVersion: v1,admissionregistration.k8s.io/v1alpha1,admissionregistration.k8s.io/v1beta1,admission.k8s.io/v1beta1,apps/v1beta1,apps/v1beta2,apps/v1,authentication.k8s.io/v1,authentication.k8s.io/v1beta1,authorization.k8s.io/v1,authorization.k8s.io/v1beta1,autoscaling/v1,autoscaling/v2beta1,batch/v1,batch/v1beta1,batch/v2alpha1,certificates.k8s.io/v1beta1,extensions/v1beta1,events.k8s.io/v1beta1,imagepolicy.k8s.io/v1alpha1,networking.k8s.io/v1,policy/v1beta1,rbac.authorization.k8s.io/v1,rbac.authorization.k8s.io/v1beta1,rbac.authorization.k8s.io/v1alpha1,scheduling.k8s.io/v1alpha1,settings.k8s.io/v1alpha1,storage.k8s.io/v1beta1,storage.k8s.io/v1,storage.k8s.io/v1alpha1,
+++ [0224 16:10:13] Running tests without code coverage
can't load package: package k8s.io/kubernetes/pkg/kubelet/winstats: build constraints exclude all Go files in /home/fujitsu/go/src/k8s.io/kubernetes/_output/local/go/src/k8s.io/kubernetes/pkg/kubelet/winstats
!!! [0224 16:10:15] Call tree:
!!! [0224 16:10:15]  1: hack/make-rules/test.sh:402 runTests(...)
Makefile:182: recipe for target 'test' failed
make: *** [test] Error 1
```

```release-note
NONE
```

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move pod-check forward

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

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

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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remove gcloud docker -- since it's deprecated

docker handles this now and it raises an error.

try 3

```release-note
NONE
```

cloud-controller-manager get /healthz instead of calling restclient.ServerAPIVersions to wait for apiserver being healthy

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improve code comment

**What this PR does / why we need it**:
improve code comment
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```NONE

```

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Update device plugin e2e_node test to not changing Kubelet config

as DevicePlugins feature is enabled by default now.



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

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

**Special notes for your reviewer**:

**Release note**:

```release-note

```

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cleanup useless functions in pkg/quota/evaluator/core/services.go

**What this PR does / why we need it**:
cleanup useless functions in pkg/quota/evaluator/core/services.go

**Release note**:

```release-note
NONE
```

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kube-scheduler: Support extender managed extended resources in kube-scheduler

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

This is the continuation of https://github.com/kubernetes/kubernetes/pull/58851.

- This PR adds new extender configurations in scheduler policy config.
    - A set of extended resource names can be specified in an extender config. They are the resources that are managed by the extender. The scheduler will only send pods to the extender if the pod requests at least one of the extended resources in the set.
    - An `IgnoredByScheduler` flag can be set along with each of such resources. If this flag is set to true, the scheduler will not check the resource in the `PodFitsResources` predicate.
- This PR also changes the default behavior of the `PodFitsResources` predicate. Now, by default, `PodFitsResources` will ignore the extended resources that are not in node status. This is required to support extender managed extended resources (including cluster-level resources) on node. Note that in kube-scheduler we override the default behavior by not ignoring such missing extended resources.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes https://github.com/kubernetes/kubernetes/issues/53616 https://github.com/kubernetes/kubernetes/issues/58850 

**Special notes for your reviewer**:

**Release note**:

```
Support extender managed extended resources in kube-scheduler
```