Automatic merge from submit-queue (batch tested with PRs 36543, 38189, 38289, 38291, 36724)

context.Context should be the first parameter of a function in vsphere

**What this PR does / why we need it**:
Change the position of the context.Context parameter.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #

**Special notes for your reviewer**:
golint
**Release note**:

```release-note
```
Signed-off-by: yupeng <yu.peng36@zte.com.cn>

Automatic merge from submit-queue (batch tested with PRs 36543, 38189, 38289, 38291, 36724)

kube-up: Only specify ETCD_QUORUM_READ if non-empty

Automatic merge from submit-queue (batch tested with PRs 36543, 38189, 38289, 38291, 36724)

add authentication/authorization to kubernetes-discovery

Wires authentication and authorization into `kubernetes-discovery` and re-enables the `local-up-cluster.sh` along with proper permission granting for RBAC cases.

@sttts @liggitt

Automatic merge from submit-queue (batch tested with PRs 36543, 38189, 38289, 38291, 36724)

Kubelet: only check podUID when it is actually set

Fixes #38188.

cc/ @timstclair @yujuhong

Automatic merge from submit-queue

Fix scheduler_perf test so that QPS is non-zero even if there is a scheduling "cold start" 

@gmarek  ... is something like this more realistic as an expectation ?  That is, wait till scheduling starts, then wait 1 second before any polling attempts....  i.e. 

- gaurantee uniform sleep before measure, by doing it first rather then last
- print the initial status so that its easier to debug in case of issues

#36532

Automatic merge from submit-queue (batch tested with PRs 38294, 37009, 36778, 38130, 37835)

Add a cloudprovider validator flag to kubeadm and update the DNS spec

Broken out from: https://github.com/kubernetes/kubernetes/pull/37568

This PR creates a flag for `cloud-provider` that validates the value before `RunInit()` is run, which makes it now act as a "real" flag
Then it removes the `k8s.io/kubernetes/pkg/cloudprovider` dependency, which makes the binary ~40MB smaller! That's _really_ worth it!

In the second commit, the DNS addon is updated to the latest version: https://github.com/kubernetes/kubernetes/blob/master/cluster/addons/dns/skydns-rc.yaml.base

@kubernetes/sig-cluster-lifecycle

Automatic merge from submit-queue (batch tested with PRs 38294, 37009, 36778, 38130, 37835)

Bump github.com/docker/go-units dependency

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**What this PR does / why we need it**: Bump [github.com/docker/go-units](https://github.com/docker/go-units/) to include https://github.com/docker/go-units/pull/22 which improves the precision of human durations ("about an hour ago", "2 days ago", etc).

**Which issue this PR fixes**: Issue detected in OpenShift: https://github.com/openshift/origin/issues/11967

**Release note**:
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NONE
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Automatic merge from submit-queue (batch tested with PRs 38294, 37009, 36778, 38130, 37835)

Only configure basic auth on gci if KUBE_USER and KUBE_PASSWORD are specified.

This should not change the existing flow when KUBE_USER/KUBE_PASSWORD are specified.
It makes not specifying those a valid option that means "don't turn on basic auth".
I only did it for cluster/gce/gci for now, but others should be somewhat similar.

Automatic merge from submit-queue (batch tested with PRs 38294, 37009, 36778, 38130, 37835)

fix permissions when using fsGroup

Currently, when an fsGroup is specified, the permissions of the defaultMode are not respected and all files created by the atomic writer have mode 777.  This is because in `SetVolumeOwnership()` the `filepath.Walk` includes the symlinks created by the atomic writer.  The symlinks have mode 777 when read from `info.Mode()`.  However, when the are chmod'ed later, the chmod applies to the file the symlink points to, not the symlink itself, resulting in the wrong mode for the underlying file.

This PR skips chmod/chown for symlinks in the walk since those operations are carried out on the underlying file which will be included elsewhere in the walk.

xref https://bugzilla.redhat.com/show_bug.cgi?id=1384458

@derekwaynecarr @pmorie

Automatic merge from submit-queue (batch tested with PRs 38294, 37009, 36778, 38130, 37835)

Re-use tested ratelimiter

The ratelimiter introduced in #35583 is not working correctly when called from multiple threads
This reverts to the tested ratelimiter we were previously using to unblock 1.5 (automated revert wasn't possible)
Ref #38273

reproducing test case:
```
func TestMultiThreadedBlocking(t *testing.T) {
	done := make(chan bool)

	// 100 QPS, burst of 100
	b := NewBucketWithRate(100, 100)

	go func() {
		defer close(done)
		fmt.Println(time.Now(), "Waiting for 1000 (should block for ~9-10 seconds)")
		b.Wait(1000)
		fmt.Println(time.Now(), "Got 1000")
	}()

	// give the request for 1000 plenty of time to take the tokens
	time.Sleep(2 * time.Second)
	fmt.Println(time.Now(), "Waiting for 1 (should wait until 1000 block is refilled)")
	b.Wait(1)
	fmt.Println(time.Now(), "Got 1 (should happen right after the wait for 1000 completes)")

	<-done
}

$ go test ./pkg/util/ratelimit/ -v -run TestMultiThreadedBlocking
=== RUN   TestMultiThreadedBlocking
2016-12-07 12:15:36.222133049 -0500 EST Waiting for 1000 (should block for ~9-10 seconds)
2016-12-07 12:15:38.222797752 -0500 EST Waiting for 1 (should wait until 1000 block is refilled)
2016-12-07 12:15:38.222897951 -0500 EST Got 1 (should happen right after the wait for 1000 completes)
2016-12-07 12:15:45.223125234 -0500 EST Got 1000
```

in contrast, the same test run against juju/ratelimit:
```
go test ./pkg/util/flowcontrol/ -v -run TestMultiThreadedBlocking
=== RUN   TestMultiThreadedBlocking
2016-12-07 12:32:56.796077782 -0500 EST Waiting for 1000 (should block for ~9-10 seconds)
2016-12-07 12:32:58.799159059 -0500 EST Waiting for 1 (should wait until 1000 block is refilled)
2016-12-07 12:33:05.801076002 -0500 EST Got 1000
2016-12-07 12:33:05.807510387 -0500 EST Got 1 (should happen right after the wait for 1000 completes)
--- PASS: TestMultiThreadedBlocking (9.01s)
```

Reverts changes in cebfc821

Automatic merge from submit-queue (batch tested with PRs 35101, 38215, 38092)

fix alias conflict of clusterrolebinding

create_configmap alias is "cm"

Automatic merge from submit-queue (batch tested with PRs 35101, 38215, 38092)

fix informer generation

Informer generation doesn't work for informers from a different clientset.  This updates the generator to generate the internal interfaces required to break the cycle.

@ncdc take a look at the last two commits.

Automatic merge from submit-queue (batch tested with PRs 35101, 38215, 38092)

auth duplicate detect

I think we should not allow people set duplicate tokens in token file or set duplicate usernames in password file. because the default action overwriting the old data may let people misunderstand.

Fix #38290

Create a new cloud-provider flag in order to catch wrong args directly and don't import the cloudprovider package and save ~50% in binary size

Automatic merge from submit-queue

Disable kubernetes-discovery in local-up-cluster.sh

fix #38257

Fixes local-up-cluster until kubernetes-discovery flags are hooked up

Automatic merge from submit-queue

add default label to rbac bootstrap policy

allow people to retrieve information of bootstrap policy by label :

`kubectl get clusterroles -l key=value` 
`kubectl get clusterrolebindings -l key=value`

Automatic merge from submit-queue

update local-up-cluster to allow full authentication proxying

Adds group and header information in auth proxy authenticator options for `local-up-cluster.sh`.  Must have been missed in the rebase madness.

Automatic merge from submit-queue (batch tested with PRs 38282, 38281)

Fix skip logic in e2e framework

Fixes 37792

cc: @wojtek-t

Automatic merge from submit-queue

e2e: mark 3rd portforwarding test as flaky

Follow-up of https://github.com/kubernetes/kubernetes/pull/38194 and https://github.com/kubernetes/kubernetes/issues/27680#issuecomment-265392033.

cc @kubernetes/sig-testing

Automatic merge from submit-queue (batch tested with PRs 38276, 38193)

Collect controller-manager logs from kubemark

Automatic merge from submit-queue

Bump Cluster Autoscaler to 0.4.0

This is the  same binary as 0.4.0-beta1, that has been tested for the last couple weeks.

@saad-ali This should be cherry-picked to 1.5 release.

```release-note
Cluster Autoscaler in version 0.4.0
```

cc: @fgrzadkowski @piosz @jszczepkowski

Automatic merge from submit-queue (batch tested with PRs 38181, 38128, 36711)

etcd2: have prefix always prepended

The prefix issue is discussed in #36290.

This is fixing etcd2 behavior separately.

**release note**:
```
etcd2: have prefix always prepended
```

Automatic merge from submit-queue (batch tested with PRs 38181, 38128, 36711)

Adding correct secret type for Ceph RBD storageclass provisioner example

StorageClass now requires provider-specific secret types, adding them to the RBD provisioning docs.

Automatic merge from submit-queue (batch tested with PRs 38181, 38128, 36711)

Remove redundant conditional statement

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

1. remove redundant conditional statement
2. replace  errors.New(fmt.Sprintf with fmt.Errorf 

Thanks.

**Special notes for your reviewer**:

**Release note**:
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Automatic merge from submit-queue

Cache additional information in schedulercache.NodeInfo to speedup scheduler

Ref #35117

Automatic merge from submit-queue

Enable OpenAPI spec validation

Spec validation was failing on Jenkins. I am enabling it in this PR to figure out if we can get it pass. No review is necessary until all test passes.

Automatic merge from submit-queue (batch tested with PRs 37693, 38085)

fix typo in scale

fix typo.