Automatic merge from submit-queue (batch tested with PRs 49129, 50436, 50417, 50553, 47587)

Avoid rsync of .git directory

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

We don't really need the .git directory to be transferred. This
problem was introduced in the PR #46193:
"Run the update-staging-godeps script inside a docker container"


**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**:
Fixes #50272

**Release note**:

```release-note
NONE
```

Automatic merge from submit-queue (batch tested with PRs 49129, 50436, 50417, 50553, 47587)

Fix Type Taint comment

**What this PR does / why we need it**:
remvoe redundant words in Type `Taint`.

**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 @k82cn 

**Release note**:

```release-note
None
```

Automatic merge from submit-queue (batch tested with PRs 49129, 50436, 50417, 50553, 47587)

Revert "Remove old node role label that is not used by kubeadm"

Revert the commit that removed printing of node roles from kubectl.

It sounds like we also need to update the labels we inspect, as these were previously removed.  But starting with a clean revert.

Issue #49124

```release-note
NONE
```

Automatic merge from submit-queue

Fix dropped errors in vsphere_volume

**What this PR does / why we need it**: Error variables are being assigned in the vsphere_volume tests, but their values are being ignored.

**Release note**:

```release-note NONE
```

Automatic merge from submit-queue

Typed static/mirror pod UID translation

Fixes #36031 , partially.

TODO:
- [x] Add types ResolvedPodUID and MirrorPodUID.
- [x] Use the ResolvedPodUID type with minimal changes.
- [x] Use the MirrorPodUID type with minimal changes.
- [x] Clarify whether the new types should be used anywhere else; if so make the agreed upon changes.

```NONE
```

Automatic merge from submit-queue

move retry to client-go

Move `k8s.io/kubernetes/pkg/client/retry` to `k8s.io/client-go/util/retry`.

Part of a series of PRs to address kubernetes/community#598

```release-note
NONE
```

Automatic merge from submit-queue

Bumped Heapster version to 1.4.1

Automatic merge from submit-queue (batch tested with PRs 49904, 50484, 50214)

Refactor addons into multiple packages

**What this PR does / why we need it**:
https://github.com/kubernetes/kubeadm/issues/348

**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/kubeadm/issues/348

Automatic merge from submit-queue (batch tested with PRs 49904, 50484, 50214)

Adding support for internal IP for e2e tests

Currently IssueSSHComand in util.go only checks for External IP address
to ssh, this PR adds check for internal IP too.
Closes #50630

Automatic merge from submit-queue

Fix indent of ginkgo-e2e.sh

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

The condition of GINKGO_UNTIL_IT_FAILS didn't contain a valid indent.
So this PR fixes it for readable code.

Automatic merge from submit-queue (batch tested with PRs 50094, 48966, 49478, 50593, 49140)

Kubelet manage hosts file for HostNetwork Pods instead of Docker

**What this PR does / why we need it**: Currently, Docker manages the hosts file for containers inside Pods using hostNetwork. It creates discrepancy between how we treat hostNetwork and non-hostNetwork Pods. Kubelet should manage the file regardless of the network setup.

**Which issue this PR fixes**: fixes #48397 more context in https://github.com/kubernetes/kubernetes/issues/43632#issuecomment-304376441

**Special notes for your reviewer**: Because the new logic relies on reading the node filesystem, I'm not sure how to write a proper unit test. I was thinking about using a node e2e test to cover the case, but suggestions are greatly welcomed.

**Release note**:
```release-note
Kubelet now manages `/etc/hosts` file for both hostNetwork Pods and non-hostNetwork Pods.
```

/kind feature
/sig node

@yujuhong @hongchaodeng @thockin
@kubernetes/sig-network-feature-requests @kubernetes/sig-node-feature-requests

Automatic merge from submit-queue (batch tested with PRs 50094, 48966, 49478, 50593, 49140)

some small fix in verify-flags-underscore

1. exceptions.txt and known-flags.txt are deleted, remove them from
code too.
2. remove some duplicated flags from excluded-flags.txt

**Release note**:

```
NONE
```

Automatic merge from submit-queue (batch tested with PRs 50094, 48966, 49478, 50593, 49140)

[kube-proxy] Move UDP conntrack operations together to pkg/proxy/util/conntrack.go

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

Fix TODO in pkg/proxy/iptables.go, see

https://github.com/kubernetes/kubernetes/blob/master/pkg/proxy/iptables/proxier.go#L1632

Move UDP conntrack operations together to from `pkg/proxy/iptables/proxier.go` to `pkg/proxy/util/conntrack.go` so that make them more consistent and add some UTs.

**Which issue this PR fixes**

Fixes #49477

**Special notes for your reviewer**:

```release-note
NONE
```

Automatic merge from submit-queue (batch tested with PRs 50094, 48966, 49478, 50593, 49140)

Migrate sig-auth e2e tests.

**What this PR does / why we need it:** This PR adds [sig-auth] prefix to
workload e2e tests in accord to requirements of adding a SIG dashboard
to testgrid. Refer PR #48781 for guidelines.

**Release note**:

```release-note
```

Automatic merge from submit-queue (batch tested with PRs 50094, 48966, 49478, 50593, 49140)

apimachinery: remove pre-apigroups import path logic

Replacing #50093.

Automatic merge from submit-queue

Task 3: Add MemoryPressure toleration for no BestEffort pod.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: part of #42001 

**Release note**:
```release-note
After 1.8, admission controller will add 'MemoryPressure' toleration to Guaranteed and Burstable pods.
```

**What this PR does / why we need it:** This PR adds [sig-auth] prefix to
workload e2e tests in accord to requirements of adding a SIG dashboard
to testgrid. Refer PR #48781 for guidelines.

Automatic merge from submit-queue

Set Cluster Autoscaler version to 0.6.1-beta2

To stabilise CA e2e tests.

Automatic merge from submit-queue

Increase kibana CPU limit to sped up the startup

Similarly to Elasticsearch, Kibana requires some additional CPU during startup to build caches. 

Fixes https://github.com/kubernetes/kubernetes/issues/50610

/cc @piosz @coffeepac @aknuds1

Automatic merge from submit-queue

Use the core client with explicit version in test

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

When going through scheduling e2e tests, found some places using `clientSet.Core()` which is now deprecated, this PR is to fix them.

**Which issue this PR fixes**: fixes part of #49535

**Special notes for your reviewer**:

/cc @kubernetes/sig-api-machinery-pr-reviews @kubernetes/sig-scheduling-pr-reviews 

**Release note**:

```release-note
none
```

Automatic merge from submit-queue (batch tested with PRs 50139, 49629)

Remove etcd v2 data when upgrading to 3.1.* version

@jpbetz @lavalamp

Automatic merge from submit-queue

codegen: skip generation of informers and listers on resources with missing verbs

This patch will prevent generation of listers and informers for resources that does not implement the required verbs (list, get, watch). Currently informers and listers are generated for those resources which cause a compilation failure.

Automatic merge from submit-queue (batch tested with PRs 47034, 50329)

RawExtension unmarshal will produce empty objects if the original object was nil #50323

**What this PR does / why we need it**:
marshaled nil objects will be unmarshaled as nil objects instead of a byte array "null", which better represents the original object before marshaling

fixes #50323

@kubernetes/sig-api-machinery-bugs

Automatic merge from submit-queue (batch tested with PRs 47034, 50329)

Fix comments

**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 #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

Automatic merge from submit-queue

Add image e2e-net-amd64 to CommonImageWhiteList

**What this PR does / why we need it**:
Add `gcr.io/google_containers/e2e-net-amd64:1.0` to white list to avoid timeout.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #50590

**Special notes for your reviewer**:
/cc @bowei @Random-Liu 

**Release note**:

```release-note
NONE
```

Automatic merge from submit-queue

Delete redundant print 'got:'

**What this PR does / why we need it**:
Delete redundant print 'got:'

**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/50592

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

Automatic merge from submit-queue

Validate token length of TokenReview

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

I find API Resource TokenReview has no validation yet. Without validation, client may post unexpected data to API Server. I think we need to validate it before processing it.

This PR Validate TokenReview Resource.

Fixes #50588

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

1. exceptions.txt and known-flags.txt are deleted, remove them from
code too.
2. remove some duplicated flags from excluded-flags.txt

Automatic merge from submit-queue

Support seccomp profile from container's security context

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

Support seccomp profile from container's security context, followup of #46332.

**Which issue this PR fixes** 

fixes #46332.

**Special notes for your reviewer**:

~~Depends on #49179. (already merged)~~

**Release note**:

```release-note
NONE
```