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Explicitly set CLOUDSDK_CONFIG override early in e2e-runner

I'm guessing this is why a number of gci-on-gke builds started failing after https://github.com/kubernetes/test-infra/pull/432 was merged - we're overriding the gcloud configuration location from the default, so the activated service account no longer works. Previously we did this service activation late, but after we'd overridden the value.

I've changed it to explicitly set to a known-good value every time at the very start.

cc @vishh @maisem @spxtr @fejta

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Revert revert 30090 with fix

This reverts #31297 (which originally reverted #30090) and applies a fix to stop the fd leak that was exposed by #30090.

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Use `make release` on Jenkins to support crossbuilds

Partner PR to https://github.com/kubernetes/test-infra/pull/440 to fix https://github.com/kubernetes/test-infra/issues/393.

We probably should pull the build functionality out of e2e.go entirely, but I leave that to future work.

cc @luxas @david-mcmahon @fejta

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Fix AWS reporting "The parameter KmsKeyId requires the parameter Encrypted to be set."

- use aws.String/Int/Bool functions
- don't set the key to empty string, use nil instead

@justinsb @kubernetes/sig-storage

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Federation controller tests refactoring - move common func to utils

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

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Avoid sorting lists when unnecessary

I've seen ThreadSafeMap::List consuming ~30% of whole CPU usage, spending the whole time in sorting (while it is in fact completely unneded).

Previously this code used http.Get and failed to read/close resp.Body, which
prevented network connection reuse, leaking fds. Now we use http.Head
instead, because its response always has a nil Body, so we don't have to
worry about read/close.

This reverts the revert of #30090 and #31282.

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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
```

- use aws.String/Int/Bool functions
- don't set the key to empty string, use nil instead

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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