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Run Rescheduler e2e on GCE only

fix #31277

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Implement ExternalName in kube-dns

Part of the ongoing saga formerly known as https://github.com/kubernetes/features/issues/33

This is the prelude (first commit) in #30931, spawn into a separate PR to allow building a new kube-dns image before e2e tests (the rest of #30931) are updated.

ExternalName allows kubedns to return CNAME records for external
services. No proxying is involved.

cc @thockin

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Fix panics in federation e2e tets

cc: @quinton-hoole @madhusudancs

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change to stderr

`fmt.Fprint(out, "You must specify the type of resource to describe. ", valid_resources)`

change this to stderr.

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skip benchmark in jenkins serial test

This PR changes jenkins-serial.properties to skip benchmark tests (with tag [Benchmark]) in jenkins serial tests. It also add more comments in run_e2e.go.

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Add admission controller for default storage class.

The admission controller adds a default class to PVCs that do not require any
specific class. This way, users (=PVC authors) do not need to care about
storage classes, administrator can configure a default one and all these PVCs
that do not care about class will get the default one.

The marker of default class is annotation "volume.beta.kubernetes.io/storage-class", which must be set to "true" to work. All other values (or missing annotation) makes the class non-default.

Based on @thockin's code, added tests and made it not to reject a PVC when no class is marked as default.
. 
@kubernetes/sig-storage

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support Azure data disk volume

This is a WIP of supporting azure data disk volume. Will add test and dynamic provisioning support once #29006 is merged

replace #25915
fix #23259

@kubernetes/sig-storage 
@colemickens @brendandburns

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Add ScaleExpansion to client v1.4

**What this PR does / why we need it**:
The generated v1.4 did not carry over the complete ScaleExpansion interface. The unversioned client is using this interface and should be in sync with generated client.

**Release note**:
```release-note

NONE
```

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kubectl: display ready replicas in 'get {rs,rc}'

Fixes https://github.com/kubernetes/kubernetes/issues/7483

@kubernetes/kubectl @janetkuo @bgrant0607

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Optimise the ValidateBytes function

The PR optimise the "ValidateBytes" function in factory.go. Too much "if" branches is poor readability, use "switch" to look better.

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fix Openstack provider to allow more than one service port for lbaas v2

This resolves bug #30477 where if a service defines multiple ports for load balancer, the plugin will fail with multiple ports are not supported.

@anguslees @jianhuiz

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Add kubelet --network-plugin-mtu flag for MTU selection

* Add network-plugin-mtu option which lets us pass down a MTU to a network provider (currently processed by kubenet)
* Add a test, and thus make sysctl testable

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Increase the AppArmor pod stop timeout to match the start timeout

Fixes https://github.com/kubernetes/kubernetes/issues/30750

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Let Services preserve client IPs and not double-hop from external LBs (alpha)

Closes #19754

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Fix path to kubernetes_skew

Previously this was `$(pwd)/kubernetes/../kubernetes_old` this is equivalent to `$(pwd)/kubernetes_old` although we also changed the `old` to `skew` instead.

Fixes https://github.com/kubernetes/kubernetes/issues/31149

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Clarify documentation that new admission control plugin must be imported

```release-note
```

Admission control design doc doesn't mention importing the plugin to plugins.go. I was unable to get the plugin to build into my binary without it. Updated documentation to prevent future confusion.

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Sort hack/.linted packages

Appending to the file by default creates merge conflicts in the submit queue. Sorting will reduce that considerably.

Add feature gate (ExternalTrafficLocalOnly) for alpha feature

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Node E2E: Extend serial test suite timeout to 3 hours.

Addresses https://github.com/kubernetes/kubernetes/issues/30550#issuecomment-241176666.

Extend the serial test timeout to 3 hours.

@coufon

Revert kubelet dynamic config

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two nits for kubelet syncPod

a useless ‘(’ and a log level should be info

This reverts commit fe808ec2, reversing
changes made to f297ea96.

This reverts commit 5981aa8b, reversing
changes made to fe808ec2.

Mark dynamic kubelet configuration test serial

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[Kubelet] Optionally consume configuration from <node-name> named config maps

This extends the Kubelet to check the API server for new node-specific config, and exit when it finds said new config.

/cc @kubernetes/sig-node @mikedanese @timstclair @vishh

**Release note**:
```
Extends Kubelet with Alpha Dynamic Kubelet Configuration. Please note that this alpha feature does not currently work with cloud provider auto-detection.
```

Admission control design doc doesn't mention importing the plugin to plugins.go. I was unable to get the plugin to build into my binary without it.

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[GarbageCollector] Allow per-resource default garbage collection behavior

What's the bug:
When deleting an RC with `deleteOptions.OrphanDependents==nil`, garbage collector is supposed to treat it as `deleteOptions.OrphanDependents==true", and orphan the pods created by it. But the apiserver is not doing that.

What's in the pr:
Allow each resource to specify the default garbage collection behavior in the registry. For example, RC registry's default GC behavior is Orphan, and Pod registry's default GC behavior is CascadingDeletion.

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Test if 2 federated informers in rs controller are in sync

cc: @quinton-hoole @kubernetes/sig-cluster-federation

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Enable v3 Client as the default on UTs

Updates the default initialization to use clientv3 interface to etcd3, and fixes the UTs.  

This PR includes a cherry-pick of https://github.com/kubernetes/kubernetes/pull/30634 so we can validate the tests, so do not merge until that PR is complete.

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Federated namespace controller e2e test

Depends on #30443

cc: @quinton-hoole @wojtek-t @kubernetes/sig-cluster-federation

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Tests for data update in federated secret controller

cc: @quinton-hoole @kubernetes/sig-cluster-federation