Avoid directly accessing an unstructured type if it is not required.

OwnerReference is common.

It is a versioned type.

Automatic merge from submit-queue

fix duplicate validation/field/errors

**Release note**:

``` release-note
release-note-none
```

Related PR: https://github.com/kubernetes/kubernetes/pull/30313

PR #30313 fixed duplicate errors for invalid aggregate errors in
https://github.com/kubernetes/kubernetes/blob/master/pkg/kubectl/cmd/util/helpers.go

However, duplicate aggregate errors that went through
https://github.com/kubernetes/kubernetes/blob/master/pkg/util/validation/field/errors.go
were not affected by that patch.

This patch adds duplicate aggregate error checking to
`pkg/util/validation/field/errors.go`
##### Before

`$ kubectl set env rc/idling-echo-1 test-abc=1234`

```
error: ReplicationController "idling-echo-1" is invalid:
[spec.template.spec.containers[0].env[0].name: Invalid value:
"test-abc": must be a C identifier (matching regex
[A-Za-z_][A-Za-z0-9_]*): e.g. "my_name" or "MyName",
spec.template.spec.containers[1].env[0].name: Invalid value: "test-abc":
must be a C identifier (matching regex [A-Za-z_][A-Za-z0-9_]*): e.g.
"my_name" or "MyName", spec.template.spec.containers[0].env[0].name:
Invalid value: "test-abc": must be a C identifier (matching regex
[A-Za-z_][A-Za-z0-9_]*): e.g. "my_name" or "MyName",
spec.template.spec.containers[1].env[0].name: Invalid value: "test-abc":
must be a C identifier (matching regex [A-Za-z_][A-Za-z0-9_]*): e.g.
"my_name" or "MyName"]
```

`$ kubectl set env rc/node-1 test-abc=1234`

```
error: ReplicationController "idling-echo-1" is invalid:
[spec.template.spec.containers[0].env[0].name: Invalid value:
"test-abc": must be a C identifier (matching regex
[A-Za-z_][A-Za-z0-9_]*): e.g. "my_name" or "MyName",
spec.template.spec.containers[1].env[0].name: Invalid value: "test-abc":
must be a C identifier (matching regex [A-Za-z_][A-Za-z0-9_]*): e.g.
"my_name" or "MyName"]
```
##### After

`$ kubectl set env rc/idling-echo-1 test-abc=1234`

```
error: ReplicationController "idling-echo-1" is invalid:
[spec.template.spec.containers[0].env[0].name: Invalid value:
"test-abc": must be a C identifier (matching regex
[A-Za-z_][A-Za-z0-9_]*): e.g. "my_name" or "MyName",
spec.template.spec.containers[1].env[0].name: Invalid value: "test-abc":
must be a C identifier (matching regex [A-Za-z_][A-Za-z0-9_]*): e.g.
"my_name" or "MyName"]
```

`$ kubectl set env rc/node-1 test-abc=1234`

```
error: ReplicationController "node-1" is invalid:
spec.template.spec.containers[0].env[0].name: Invalid value: "test-abc":
must be a C identifier (matching regex [A-Za-z_][A-Za-z0-9_]*): e.g.
"my_name" or "MyName"
```

Automatic merge from submit-queue

Remove json serialization annotations from internal types

fixes #3933

Internal types should never be serialized, and including json serialization tags on them makes it possible to accidentally do that without realizing it.

fixes in this PR:

* types
  * [x] remove json tags from internal types
  * [x] fix references from serialized types to internal ObjectMeta
* generation
  * [x] remove generated json codecs for internal types (they should never be used)
* kubectl
  * [x] fix `apply` to operate on versioned object
  * [x] fix sorting by field to operate on versioned object
  * [x] fix `--record` to build annotation patch using versioned object
* hpa
  * [x] fix unmarshaling to internal CustomMetricTargetList in validation
* thirdpartyresources
  * [x] fix encoding API responses using internal ObjectMeta
* tests
  * [x] fix tests to use versioned objects when checking encoded content
  * [x] fix tests passing internal objects to generic printers

follow ups (will open tracking issues or additional PRs):
- [ ] remove json tags from internal kubeconfig types (`kubectl config set` pathfinding needs to work against external type)
- [ ] HPA should version CustomMetricTargetList serialization in annotations
- [ ] revisit how TPR resthandlers encoding objects
- [ ] audit and add tests for printer use (human-readable printer requires internal versions, generic printers require external versions)
- [ ] add static analysis tests preventing new internal types from adding tags
- [ ] add static analysis tests requiring json tags on external types (and enforcing lower-case first letter)
- [ ] add more tests for `kubectl get` exercising known and unknown types with all output options

Automatic merge from submit-queue

providers: Remove long-deprecated Instances.List()

Fix the cross-build

This method has been unused by k8s for some time, and yet is the last
piece of the cloud provider API that encourages provider names to be
human-friendly strings (this method applies a regex to instance names).

Actually removing this deprecated method is part of a long effort to
migrate from instance names to instance IDs in at least the OpenStack
provider plugin.

Automatic merge from submit-queue

Add support for Azure Container Registry, update Azure dependencies

@colemickens

Automatic merge from submit-queue (batch tested with PRs 34002, 38535, 37330, 38522, 38423)

Fix panic in vSphere cloud provider

Currently vSphere Cloud Provider triggers panic in controller-manager pod kubernetes. This is because it queries for the cluster name from the VC. We have eliminated that code from the vSphere cloud provider. 

Fixes #36295

Automatic merge from submit-queue (batch tested with PRs 34002, 38535, 37330, 38522, 38423)

Node E2E: `make test-e2e-node` runs the same test with pr builder by default.

This PR makes `make test-e2e-node` run non-serial, non-flaky, non-slow test by default.
This will make it easier to use.

/cc @timstclair

Automatic merge from submit-queue (batch tested with PRs 34002, 38535, 37330, 38522, 38423)

Rename pet to stateful pods in statefulset e2e tests logs

Follow up https://github.com/kubernetes/kubernetes/pull/37243#discussion_r89193790

Note that only mentions of pet in logs are renamed, but not variable name, or file name / import path 

@foxish 

```release-note
NONE
```

Automatic merge from submit-queue

Remove hack/verify-munge-docs.sh from pre-commit hooks

Follow up of #38309

Automatic merge from submit-queue

fix broken cluster/centos and enhance the style

replace the PR #33818

Automatic merge from submit-queue

fix typo in pet_set

fix typo in pet_set.

Automatic merge from submit-queue (batch tested with PRs 37677, 38519)

Better deal with failures under golang 1.8beta1

If there is any error in the initial parsing then we should just
try adding the scheme.

url.Parse(base) has changed in 1.8. Please see the following change
https://github.com/golang/go/commit/c5ccbdd22bdbdc43d541b7e7d4ed66ceb559030e

Fixes #38380

Automatic merge from submit-queue

Proper fix for non-receiving watchers

Follow up on #37195

Automatic merge from submit-queue (batch tested with PRs 37270, 38309, 37568, 34554)

Ability to quota storage by storage class

Adds the ability to quota storage by storage class.
1. `<storage-class>.storageclass.storage.k8s.io/persistentvolumeclaims` - quota the number of claims with a specific storage class
2. `<storage-class>.storageclass.storage.k8s.io/requests.storage` - quota the cumulative request for storage in a particular storage class.

For example:

```
$ cat quota.yaml
apiVersion: v1
kind: ResourceQuota
metadata:
  name: storage-quota
spec:
  hard:
    requests.storage: 100Gi
    persistentvolumeclaims: 100
    gold.storageclass.storage.k8s.io/requests.storage: 50Gi
    gold.storageclass.storage.k8s.io/persistentvolumeclaims: 5
    silver.storageclass.storage.k8s.io/requests.storage: 75Gi
    silver.storageclass.storage.k8s.io/persistentvolumeclaims: 10
    bronze.storageclass.storage.k8s.io.kubernetes.io/requests.storage: 100Gi
    bronze.storageclass.storage.k8s.io/persistentvolumeclaims: 15
$ kubectl create -f quota.yaml
$ cat pvc-bronze.yaml
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  generateName: pvc-bronze-
  annotations:
    volume.beta.kubernetes.io/storage-class: "bronze"
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 8Gi
$ kubectl create -f pvc-bronze.yaml
$ kubectl get quota storage-quota -o yaml
apiVersion: v1
kind: ResourceQuota
...
status:
  hard:
    bronze.storageclass.storage.k8s.io/persistentvolumeclaims: "15"
    bronze.storageclass.storage.k8s.io/requests.storage: 100Gi
    gold.storageclass.storage.k8s.io/persistentvolumeclaims: "5"
    gold.storageclass.storage.k8s.io/requests.storage: 50Gi
    persistentvolumeclaims: "100"
    requests.storage: 100Gi
    silver.storageclass.storage.k8s.io/persistentvolumeclaims: "10"
    silver.storageclass.storage.k8s.io/requests.storage: 75Gi
  used:
    bronze.storageclass.storage.k8s.io/persistentvolumeclaims: "1"
    bronze.storageclass.storage.k8s.io/requests.storage: 8Gi
    gold.storageclass.storage.k8s.io/persistentvolumeclaims: "0"
    gold.storageclass.storage.k8s.io/requests.storage: "0"
    persistentvolumeclaims: "1"
    requests.storage: 8Gi
    silver.storageclass.storage.k8s.io/persistentvolumeclaims: "0"
    silver.storageclass.storage.k8s.io/requests.storage: "0"
```

Automatic merge from submit-queue (batch tested with PRs 37270, 38309, 37568, 34554)

kubeadm UX improvements for the v1.5 stable release

This PR targets the next stable kubeadm release.

It's work in progress, but please comment on it and review, since there are many changes.

I tried to group the commits logically, so you can review them separately.

Q: Why this large PR? Why not many small?
A: Because of the Submit Queue and the time it takes.

PTAL @kubernetes/sig-cluster-lifecycle

_Edit:_ This work was splitted up in three PRs in total

Automatic merge from submit-queue (batch tested with PRs 37270, 38309, 37568, 34554)

Remove update/verify-munge-docs.sh

These scripts are no long needed because:
1. most docs are moved to other repos
2. the mungers are pre-processing the docs for gh pages, which are created with a whole different process now.

cc @bgrant0607 @thockin

Automatic merge from submit-queue (batch tested with PRs 37270, 38309, 37568, 34554)

Remove duplicate get errs

old:
```shell
$ kubectl get ns
NAME          STATUS    AGE
default       Active    2m
kube-system   Active    2m

$ kubectl get ns --all-namespaces
NAMESPACE   NAME      STATUS    AGE
error: namespace is not namespaced
error: namespace is not namespaced
```
new:
```shell
$ kubectl get ns --all-namespaces
NAMESPACE   NAME      STATUS    AGE
error: namespace is not namespaced
```

Automatic merge from submit-queue (batch tested with PRs 37860, 38429, 38451, 36050, 38463)

HPA e2e tests: fixed waiting for service creation.