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split of test-cmd

This pull moves test-cmd to a `test/cmd` folder for team maintenance.  The next commit splits the mega (6 thousand lines or so?) into files based on function.  No changes, just moves.

@kubernetes/sig-cli-maintainers 
@fejta per request

```release-note
NONE
```

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Quobyte API update

**What this PR does / why we need it**:
Quobyte vendor API update
The current version supports both UUID/name of the volume for the storage class.

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

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apiextensions-apiserver: add pkg/cmd/server/testing pkg for integration tests

In analogy to kube-apiserver, this implements a uniform apiextensions-apiserver for integration tests which can be started using customized flags.

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kubeadm: use constant instead of hardcoded path

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

Used DefaultCRISocket constant instead of hardcoded path
/var/run/dockershim.sock

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

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kubeadm: Add support for reading multiple YAML documents

**What this PR does / why we need it**:
In preparation for splitting the kubelet and kube-proxy componentconfigs out of the MasterConfiguration API struct, add support for reading multiple YAML documents

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
ref: kubernetes/kubeadm#911
Depends on:
 - [x] https://github.com/kubernetes/kubernetes/pull/65776
 - [x] https://github.com/kubernetes/kubernetes/pull/65628
 - [x] https://github.com/kubernetes/kubernetes/pull/65629

**Special notes for your reviewer**:
Please only review the `Refactor a bit of the config YAML loading code, and support loading multiple YAML documents` commit

**Release note**:

```release-note
NONE
```
@kubernetes/sig-cluster-lifecycle-pr-reviews

Automatic merge from submit-queue (batch tested with PRs 65822, 65834, 65859, 65631). 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>.

Fix field name in autoscaling e2e tests

Use new field name

```release-note
NONE
```

/cc @MaciekPytel

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apiserver: don't create self-signed certs with disabled secure serving

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Refactor kubemark docker image building logic

This PR:

- cleans up some redundant code in kubemark scripts for image-building
- removes calls to gcloud in image-building (to make it provider independent - ref https://github.com/kubernetes/kubernetes/pull/65242#issuecomment-402479648)

/cc @wojtek-t 

```release-note
NONE
```

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Update Cluster Autoscaler version to 1.3.1-beta.1

This update Cluster Autoscaler version to 1.3.1-beta.1 and changes the default value for expendable pods priority cutoff in GCP deployment.

```release-note
Cluster Autoscaler version updated to 1.3.1-beta.1. Release notes: https://github.com/kubernetes/autoscaler/releases/tag/cluster-autoscaler-1.3.1-beta.1
Default value for expendable pod priority cutoff in GCP deployment of Cluster Autoscaler changed from 0 to -10.

action required: users deploying workloads with priority lower than 0 may want to use priority lower than -10 to avoid triggering scale-up.
```

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flatten nested lists for flatten in visitor

Lists which contain lists should themselves be flattened by a flatten call to the resource builder

@kubernetes/sig-cli-maintainers 
@soltysh @juanvallejo 

```release-note
NONE
```

Automatic merge from submit-queue (batch tested with PRs 65805, 65811, 65833, 65488, 65857). 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>.

kube-scheduler: allow high ports in secure serving validation

Certain operating systems will select high port (>32768) when asked for a free port. This PR changes the validation to allow that.

```release-note
Allow kube-scheduler to listen on ports up to 65535.
```

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client-go/discovery: fix godoc package comment

Fixes https://github.com/kubernetes/client-go/issues/436

/sig api-machinery
/kind cleanup
/shrug

/assign sttts 

**Release note**:

```release-note
NONE
```

Automatic merge from submit-queue (batch tested with PRs 65805, 65811, 65833, 65488, 65857). 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>.

fix print format string

**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
```

In analogy to kube-apiserver.

Used DefaultCRISocket constant instead of hardcoded path
/var/run/dockershim.sock

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>.

kube-apiserver: drop unused loopback token in insecure mode

The token was not used. Removing the dead code.

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kubeadm: update generated files

Verify is currently broken on master. This PR fixes it.

See https://k8s-gubernator.appspot.com/build/kubernetes-jenkins/pr-logs/pull/65811/pull-kubernetes-verify/97686/ for an example error.

**Release note**:

```release-note
NONE
```

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add help description and examples to wait

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

Adds --help description and examples to the `wait` command.

cc @soltysh

Automatic merge from submit-queue (batch tested with PRs 64593, 65117, 65629, 65827, 65686). 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>.

fix `kubectl create priorityclass` failure bug

**What this PR does / why we need it**:
update` kubectl create priorityclass` command's api version.
**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 #65685 

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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[kubeadm] Remove usage of `PersistentVolumeLabel` in phases/controlplane/manifests*.go

**What this PR does / why we need it**:
Remove usage of `PersistentVolumeLabel` in phases/controlplane/manifests*.go

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Close [kubernetes/kubeadm#866](https://github.com/kubernetes/kubeadm/issues/866)

**Special notes for your reviewer**:
/assign @neolit123 

**Release note**:

```release-note
kubeadm: Remove usage of `PersistentVolumeLabel`
```

Automatic merge from submit-queue (batch tested with PRs 64593, 65117, 65629, 65827, 65686). 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>.

kubeadm: Add a `v1alpha3` API

**What this PR does / why we need it**:
Adds a (now duplicated) v1alpha3 API. Equal to `v1alpha2` now, but will be changed later.
Hopefully we'll graduate this to `v1beta1` during the v1.12 cycle.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
ref: https://github.com/kubernetes/kubeadm/issues/911
Depends on:
 - [x] https://github.com/kubernetes/kubernetes/pull/65776
 - [x] https://github.com/kubernetes/kubernetes/pull/65628

**Special notes for your reviewer**:

These commits should be reviewed:
 - `Add a duplicated v1alpha3 API`: A pure directory copy of the `v1alpha2` folder, only changed the package name in the Go files
 - `Register the v1alpha3 API in the scheme, and update the roundtrip API tests`, started registering the new API and using it internally
 - `Automated bump from v1alpha2 references to v1alpha3`: Replaced all v1alpha2 references with v1alpha3

**Release note**:

```release-note
kubeadm: Add a `v1alpha3` API.
```
@kubernetes/sig-cluster-lifecycle-pr-reviews

Automatic merge from submit-queue (batch tested with PRs 64593, 65117, 65629, 65827, 65686). 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>.

Add e2e tests for volumeMode of persistent volume

This set of e2e tests is to confirm that persistent volume works well for all volumeModes.
Coverage of the tests are shown in the figure of [Test cases], below.

Once implementation policy is confirmed to be good, we can add plugins and test cases to this.
[Test cases]
```
 #   plugin      volumeMode    Test case                                                Expectation
--- ---------- -------------- ------------------------------------------------------ ------------
 1    iSCSI      Block         (a) Create Pod with PV and confirm Read/Write to PV    Success
 2    iSCSI      Block         (b) Create Pod and restart kubelet and confirm PV      Success
 3    iSCSI      Block         (c) Create Pod and restart kubelet while deleting PV   Success
 4    iSCSI      FileSystem    (a) Create Pod with PV and confirm Read/Write to PV    Success
 5    iSCSI      FileSystem    (b) Create Pod and restart kubelet and confirm PV      Success
 6    iSCSI      FileSystem    (c) Create Pod and restart kubelet while deleting PV   Success
 7    RBD        Block         (a) Create Pod with PV and confirm Read/Write to PV    Success
 8    RBD        Block         (b) Create Pod and restart kubelet and confirm PV      Success
 9    RBD        Block         (c) Create Pod and restart kubelet while deleting PV   Success
10    RBD        FileSystem    (a) Create Pod with PV and confirm Read/Write to PV    Success
11    RBD        FileSystem    (b) Create Pod and restart kubelet and confirm PV      Success
12    RBD        FileSystem    (c) Create Pod and restart kubelet while deleting PV   Success
13    CephFS     Block         (a) Create Pod with PV and confirm Read/Write to PV    Fail
14    CephFS     FileSystem    (a) Create Pod with PV and confirm Read/Write to PV    Success
15    CephFS     FileSystem    (b) Create Pod and restart kubelet and confirm PV      Success
16    CephFS     FileSystem    (c) Create Pod and restart kubelet while deleting PV   Success
17    NFS        Block         (a) Create Pod with PV and confirm Read/Write to PV    Fail
18    NFS        FileSystem    (a) Create Pod with PV and confirm Read/Write to PV    Success
19    NFS        FileSystem    (b) Create Pod and restart kubelet and confirm PV      Success
20    NFS        FileSystem    (c) Create Pod and restart kubelet while deleting PV   Success
```




**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 #56803

**Special notes for your reviewer**:
/sig storage
@gnufied  @rootfs @jsafrane @jeffvance 

This PR is intend to reflect the comments for the below PR.
https://github.com/kubernetes/kubernetes/pull/56804

**Release note**:

```release-note
NONE
```

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clean unused function in file pkg/volume/projected/projected.go

**What this PR does / why we need it**:
It was imported by https://github.com/kubernetes/kubernetes/pull/37237
And it is unusable at first place when it was imported
**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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Add StatefulSet rollback and rolling update test with PVCs

**What this PR does / why we need it**:
Adds a StatefulSet e2e test for testing rolling upgrades and rollbacks on a StatefulSet using PVCs.

**Which issue(s) this PR fixes**:
Fixes #63940

**Release note**:

```
NONE
```
Signed-off-by: Jose A. Rivera <jarrpa@redhat.com>

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make use of request.UserAgent()

**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**:
/assign @sttts
**Release note**:

```release-note
NONE
```

Signed-off-by: Xianglin Gao <xianglin.gxl@alibaba-inc.com>