Allow to read OpenStack config from the secret

Add some logs for kubeadm join

Scheduler: Logging cleanup in predicates.go.

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

use cache size to signal undecorated storage

Remove use of `%#v` in frequently accessed code

Move protection common funcs to protectionutil

Fix goroutine leak in pkg/util/wait PollUntil()

This is some light cleanup of logs in predicates.go. In particular, some
log lines have details clarified that will make debugging easier.

I have not touched any VLOG messages, since those usually have plenty of
detail.

Fix golint failures of e2e/framework/[a-c].go

kubeadm: remove v1alpha3

Fix linting issues in pkg/kubectl/cmd/version

test/e2e/framework: add OWNERS file

Kubelet should request protobuf from the apiserver

add area/cloudprovider label for changes in pkg/cloudprovider & k8s.i…

Fix golint failures under test/e2e/[..]/gce

This fixes golint failures on the following files:
- test/e2e/framework/authorizer_util.go
- test/e2e/framework/cleanup.go
- test/e2e/framework/create.go

Use apps/v1 APIs in integration tests

fix eliminate shellcheck failures in hack/lib/golang.sh

Fix a regression in watch performance and reduce allocations in the GET path

There was no reason to have two types and this avoids ~10% of allocations
on the GET code path.

```
BenchmarkGet-12          	  100000	    109045 ns/op	   17608 B/op	     146 allocs/op

BenchmarkGet-12          	  100000	    108850 ns/op	   15942 B/op	     132 allocs/op
```

These allocations should only occur rarely.

```
BenchmarkGet-12          	  100000	    108013 ns/op	   17732 B/op	     149 allocs/op

BenchmarkGet-12          	  100000	    109045 ns/op	   17608 B/op	     146 allocs/op
```

ReplaceAllStrings always allocates, while scanning a relatively short
regex twice is slightly more CPU immediately but less later.

```
BenchmarkGet-12          	  100000	    108824 ns/op	   17818 B/op	     152 allocs/op

BenchmarkGet-12          	  100000	    108013 ns/op	   17732 B/op	     149 allocs/op
```

IsListType was causing ~100 allocations for a non list object. It is
used in a wide range of code, so perform a more targeted check.

The use of `%#v` in a hot return path for `fmt.Errorf()` was the main
victim.

Replace `%#v` with a typed error and create a cache of types that are
lists with a bounded size (probably not necessary, but safer).

```
BenchmarkGet-12          	  100000	    119635 ns/op	   20110 B/op	     206 allocs/op
BenchmarkWatchHTTP-12    	  100000	     65761 ns/op	    7296 B/op	     139 allocs/op

BenchmarkGet-12          	  100000	    109085 ns/op	   17831 B/op	     152 allocs/op
BenchmarkWatchHTTP-12    	  200000	     33966 ns/op	    1913 B/op	      30 allocs/op
```

The kubelet was not asking for application/vnd.kubernetes.protobuf
on list and get calls. It looks like we lost that code when we
moved to cert rotation. Clean up the client initialization path
and make sure that all non-dynamic clients use protobuf by default.

This fixes golint failures under test/e2e/framework/providers/gce/.

Cleanup:
* FirewallTimeoutDefault is not used at all, so remove it.
* FirewallTestTcpTimeout, FirewallTestHttpPort and FirewallTestUdpPort
  are used at test/e2e/network/firewall.go only. So move them.

Baseline:

```
BenchmarkGet-12          	  100000	    119635 ns/op	   20110 B/op	     206 allocs/op
BenchmarkWatchHTTP-12    	  100000	     65761 ns/op	    7296 B/op	     139 allocs/op
```

Updated client-go expiration cache to take in expiration policies

provide verbose output when health check fails

make describers of different versions work properly when autoscaling/v2beta2 is not supported

shorten scheduler package alias for better readability

replace AddRateLimited with Add in enqueue func

Avoid unnecessary sort for some cases in selectVictimsOnNode

Daemon Set Conformance test fails in CI process using ci-kubernetes-c…