Fix potential unbound KUBE_USER variable in gci/trusty.

Revert "Fix killing child sudo process in e2e_node tests"

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Fix killing child sudo process in e2e_node tests

Fixes #29211.

The context is we are trying to kill a process started as `sudo kube-apiserver`, but `sudo` ignores signals from the same process group. Applying `Setpgid` means the `sudo kill` process won't be in the same process group, so will not fall foul of this nifty feature.

I also took the liberty of removing some code setting `Pdeathsig` because it claims to be doing something  in the same area, but actually it doesn't do that at all.  The setting is applied to the forked process, i.e. `sudo`, and it means the `sudo` will get killed if we (`e2e_node.test`) die.  This (a) isn't what the comment says and (b) doesn't help because sending SIGKILL to the sudo process leaves sudo's child alive.

I didn't use the "hack for linux-only" approach because I think `Setpgid` is available on all platforms that `e2e_node` builds on.

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len(vmList) output format not correct

len(vmList) output format not correct, not "%s", is "%d".

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Modified etcd manifest to support clustering.

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Judge the cloud isn't nil before use it in server.go

The PR add a judgement for the cloud before use it, because cloudprovider.InitCloudProvider maybe return nil for the cloud.

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Fix ConfigMap related node e2e tests on selinux enabled systems

One selinux enabled systems, it might require to relabel
/var/lib/kubelet, otherwise following tests fail:

Summarizing 7 Failures:

```
[Fail] [k8s.io] ConfigMap [It] updates should be reflected in volume [Conformance]
/root/upstream-code/gocode/src/k8s.io/kubernetes/test/e2e_node/configmap.go:131

[Fail] [k8s.io] ConfigMap [It] should be consumable from pods in volume as non-root with FSGroup [Feature:FSGroup]
/root/upstream-code/gocode/src/k8s.io/kubernetes/test/e2e/framework/util.go:2115

[Fail] [k8s.io] ConfigMap [It] should be consumable from pods in volume with mappings as non-root [Conformance]
/root/upstream-code/gocode/src/k8s.io/kubernetes/test/e2e/framework/util.go:2115

[Fail] [k8s.io] ConfigMap [It] should be consumable from pods in volumpe [Conformance]
/root/upstream-code/gocode/src/k8s.io/kubernetes/test/e2e/framework/util.go:2115

[Fail] [k8s.io] ConfigMap [It] should be consumable from pods in volume with mappings [Conformance]
/root/upstream-code/gocode/src/k8s.io/kubernetes/test/e2e/framework/util.go:2115

[Fail] [k8s.io] ConfigMap [It] should be consumable from pods in volume with mappings as non-root with FSGroup [Feature:FSGroup]
/root/upstream-code/gocode/src/k8s.io/kubernetes/test/e2e/framework/util.go:2115

[Fail] [k8s.io] ConfigMap [It] should be consumable from pods in volume as non-root [Conformance]
/root/upstream-code/gocode/src/k8s.io/kubernetes/test/e2e/framework/util.go:2115
```
@kubernetes/rh-cluster-infra 

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Faster test

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In attempting to troubleshoot flakes with this test case I actually wanted to understand how it worked.
There's some poor comments that need work.
I added some additional output which may or may not help in debugging the flakes.
I doubt this fixes the flake.

My major concern is the 'refactor' I did of the test case to batch up runs by sub-test-case. As it stood there was a 200ms pause between each sub, so they should not have interfered with each other. Now they are just started as fast as possible, but only 20 run at a time before moving on to the next 20. I am not sure if I am violating the ethos of the original test case.

Runs on my computer are down from 2m40s -> 40s.
Getting rid of the arbitrary client limiting brings it down to ~12 seconds. 11 to fetch the image and <1 to actually run the tests against the proxies. I can add a zero to the number of loops if you want to hit it harder. It would result in 10x as much text output though.


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Use response content-type on restclient errors

Also allow a new AcceptContentTypes field to allow the client to ask for
a fallback serialization when getting responses from the server. This
allows a new client to ask for protobuf and JSON, falling back to JSON
when necessary.

The changes to request.go allow error responses from non-JSON servers to
be properly decoded.

@wojtek-t - also alters #28910 slightly (this is better output)

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Add an Azure CloudProvider Implementation

This PR adds `Azure` as a cloudprovider provider for Kubernetes. It specifically adds support for native pod networking (via Azure User Defined Routes) and L4 Load Balancing (via Azure Load Balancers).

I did have to add `clusterName` as a parameter to the `LoadBalancers` methods. This is because Azure only allows one "LoadBalancer" object per set of backend machines. This means a single "LoadBalancer" object must be shared across the cluster. The "LoadBalancer" is named via the `cluster-name` parameter passed to `kube-controller-manager` so as to enable multiple clusters per resource group if the user desires such a configuration.

There are few things that I'm a bit unsure about:

1. The implementation of the `Instances` interface. It's not extensively documented, it's not really clear what the different functions are used for, and my questions on the ML didn't get an answer.

2. Counter to the comments on the `LoadBalancers` Interface, I modify the `api.Service` object in `EnsureLoadBalancerDeleted`, but not with the intention of affecting Kube's view of the Service. I simply do it so that I can remove the `Port`s on the `Service` object and then re-use my reconciliation logic that can handle removing stale/deleted Ports. 

3. The logging is a bit verbose. I'm looking for guidance on the appropriate log level to use for the chattier bits.

Due to the (current) lack of Instance Metadata Service and lack of Virtual Machine Identity in Azure, the user is required to do a few things to opt-in to this provider. These things are called-out as they are in contrast to AWS/GCE:

1. The user must provision an Azure Active Directory ServicePrincipal with `Contributor` level access to the resource group that the cluster is deployed in. This creation process is documented [by Hashicorp](https://www.packer.io/docs/builders/azure-setup.html) or [on the MSDN Blog](https://blogs.msdn.microsoft.com/arsen/2016/05/11/how-to-create-and-test-azure-service-principal-using-azure-cli/).

2. The user must place a JSON file somewhere on each Node that conforms to the `AzureConfig` struct defined in `azure.go`. (This is automatically done in the Azure flavor of [Kubernetes-Anywhere](https://github.com/kubernetes/kubernetes-anywhere).)

3. The user must specify `--cloud-config=/path/to/azure.json` as an option to `kube-apiserver` and `kube-controller-manager` similarly to how the user would need to pass `--cloud-provider=azure`.

I've been running approximately this code for a month and a half. I only encountered one bug which has since been fixed and covered by a unit test. I've just deployed a new cluster (and a Type=LoadBalancer nginx Service) using this code (via `kubernetes-anywhere`) and have posted [the `kube-controller-manager` logs](https://gist.github.com/colemickens/1bf6a26e7ef9484a72a30b1fcf9fc3cb) for anyone who is interested in seeing the logs of the logic.

If you're interested in this PR, you can use the instructions in my [`azure-kubernetes-demo` repository](https://github.com/colemickens/azure-kubernetes-demo) to deploy a cluster with minimal effort via [`kubernetes-anywhere`](https://github.com/kubernetes/kubernetes-anywhere). (There is currently [a pending PR in `kubernetes-anywhere` that is needed](https://github.com/kubernetes/kubernetes-anywhere/pull/172) in conjuncture with this PR). I also have a pre-built `hyperkube` image: `docker.io/colemickens/hyperkube-amd64:v1.4.0-alpha.0-azure`, which will be kept in sync with the branch this PR stems from.

I'm hoping this can land in the Kubernetes 1.4 timeframe.

CC (potential code reviewers from Azure): @ahmetalpbalkan @brendandixon @paulmey

CC (other interested Azure folk): @brendandburns @johngossman @anandramakrishna @jmspring @jimzim

CC (others who've expressed interest): @codefx9 @edevil @thockin @rootfs

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Add support for kubectl create quota command

Follow-up of https://github.com/kubernetes/kubernetes/pull/19625

```
Create a resourcequota with the specified name, hard limits and optional scopes

Usage:
  kubectl create quota NAME [--hard=key1=value1,key2=value2] [--scopes=Scope1,Scope2] [--dry-run=bool] [flags]

Aliases:
  quota, q


Examples:
  // Create a new resourcequota named my-quota
  $ kubectl create quota my-quota --hard=cpu=1,memory=1G,pods=2,services=3,replicationcontrollers=2,resourcequotas=1,secrets=5,persistentvolumeclaims=10

  // Create a new resourcequota named best-effort
  $ kubectl create quota best-effort --hard=pods=100 --scopes=BestEffort
```

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Fix panic in schema test

If the swagger files for testing are lost, the func `loadSchemaForTest` or `NewSwaggerSchemaFromBytes` will return a non-nil error and a nil schema. In this case, the calling for `ValidateBytes` will result in panic. So, call Fatalf instead of Errorf.

Also fix minor typos.

Test logs:

```
--- FAIL: TestLoad (0.01s)
	schema_test.go:131: Failed to load: open ../../../api/swagger-spec/v1.json: no such file or directory
--- FAIL: TestValidateOk (0.00s)
	schema_test.go:138: Failed to load: open ../../../api/swagger-spec/v1.json: no such file or directory
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x20 pc=0x4d52df]

goroutine 10 [running]:
panic(0x15fffa0, 0xc8200100a0)
	/usr/local/go/src/runtime/panic.go:481 +0x3e6
testing.tRunner.func1(0xc820085a70)
	/usr/local/go/src/testing/testing.go:467 +0x192
panic(0x15fffa0, 0xc8200100a0)
	/usr/local/go/src/runtime/panic.go:443 +0x4e9
k8s.io/kubernetes/pkg/api/validation.TestValidateOk(0xc820085a70)
	/go/src/k8s.io/kubernetes/_output/dockerized/go/src/k8s.io/kubernetes/pkg/api/validation/schema_test.go:159 +0x79f
testing.tRunner(0xc820085a70, 0x22aad68)
	/usr/local/go/src/testing/testing.go:473 +0x98
created by testing.RunTests
	/usr/local/go/src/testing/testing.go:582 +0x892
FAIL	k8s.io/kubernetes/pkg/api/validation	0.048s
```

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reverted the code from 23688 that cause race condition with older version of Go

```release-note
* release-note-None
```


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Disable flaky unit test in admission plugin in NamespaceAutoProvision

Ref: https://github.com/kubernetes/kubernetes/issues/29473

Disables the test until the full fix is resolved in https://github.com/kubernetes/kubernetes/pull/29634

This admission controller is not in our default set, but is flaking and is a p0.

/cc @ncdc @liggitt @hodovska 

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Redirect the website to new location in gpu-support.md

The website has been changed, should be redirected to new one.

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Use nonexistent image instead of minReadySeconds in deployment rollover e2e test

Fixes #26834 

@kubernetes/deployment 

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Add rules for all directories in federation/cmd/

federation related target is not included in Makefile. Add it.
/cc @thockin 

BTW, `make help` is still WIP.

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Update pull-requests.md fix typo

Fix the make target for `make test-integration`

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Fix broken links in on-call-user-support.md

Links in `Example response` are broken.

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Rework pod waiting mechanism in e2e tests to accept pod and watch based

This PR re-applies #28212 which was reverted in #29223. The only difference is that the initial PR contained also `PodStartTimeout` shortening (see [here](https://github.com/kubernetes/kubernetes/pull/28212/commits/4b0c0bd9248e5f0fbd8455b0529ef45a519f240f)) which might caused the problems. Let's give it a 2nd try. I've tested all the flakes and they were passing on my machine.

@smarterclayton @apelisse ptal

Modified etcd manifest to support clustering.

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Kubelet: Fail kubelet if cadvisor is not started.

Fixes https://github.com/kubernetes/kubernetes/issues/28997.

We started cadvisor in `sync.Do()`, which only run once no matter cadvisor successfully starts or not.

Once it fails, kubelet will be stuck in a bad state. Kubelet could never start sync loop because there is an internal error, but kubelet would never retry starting cadvisor again.

This PR just fails kubelet when cadvisor start fails, and then relies on the babysitter to restart kubelet.
In the future, we may want to add backoff logic in the babysitter to protect the system.

On the other hand, https://github.com/kubernetes/kubernetes/pull/29492 will fix cadvisor side to prevent cadvisor failing because of these kind of transient error.

Mark P1 to match the original issue.

@dchen1107 @vishh 

Fix the make arg for `make test-integration`

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Add colhom to federation OWNERS

Depends on #28042

\cc @quinton-hoole 

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Signed-off-by: PingWang <wang.ping5@zte.com.cn>

update server.go
Signed-off-by: PingWang <wang.ping5@zte.com.cn>

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AppArmor design proposal

For https://github.com/kubernetes/features/issues/24

/cc @kubernetes/sig-node @erictune @matchstick 

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Make it possible to run node e2e with GCI.