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Fix script for updating protobufs.

Fix #25351

@thockin 

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Hack update all remove dollar symbol

When not running ./hack/update in silent mode, the script fails due to undefined ``$Updating`` variable.

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Make Kubemark assign cluster CIDRs

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create command guidance

`kubectl create <resource>` commands are multiplying (configmap, namespace, secret (2 flavors and a pull for a third), and serviceaccounts so far) and I think we should agree on the goal of those subcommands.

Right now, `kubectl run` is an easy entrypoint for new users or users who don't really care which resources are created.  It is possible to get stable output from `kubectl run`, but it really is intent-based: make this image go in some reasonable way.  At the other end of the spectrum, you can craft yaml files by hand get exactly the object you want, but that requires pretty deep API knowledge.  I think that `kubectl create <resource>` should be the starting point of the middle ground.

`kubectl create <resource>` commands should have just enough arguments to create valid objects and the expectation should be that users will use those objects as skeletons to tweak using `kubectl edit` or the future `kubectl set` to modify them after the fact.  Editing an already existing and valid object is a lot easier than creating one from scratch, so it reduces the barrier to entry.

@kubernetes/kubectl @smarterclayton @bgrant0607 @liggitt 

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Add data structure for managing go routines by name

This PR introduces a data structure for managing go routines by name. It prevents the creation of new go routines if an existing go routine with the same name exists. This will enable parallelization of the designs in https://github.com/kubernetes/kubernetes/issues/20262 and https://github.com/kubernetes/kubernetes/issues/21931 with sufficient protection to prevent starting multiple operations on the same volume.

Fix dynamic client in protobuf configuration

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Clean-up sources ready tracking in kubelet

moved sources ready tracking behind an interface, made it thread-safe.

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enable resource name and service account cases for impersonation

Adds the resource name check since that attribute was added for authorization.  Also adds a check against a separate resource for service accounts.  Allowing impersonation of service accounts to use a different resource check places control of impersonation with the same users to have the power to get the SA tokens directly.

@kubernetes/kube-iam 
@sgallagher FYI

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Kubelet eviction flag parsers and tests

The first two commits are from https://github.com/kubernetes/kubernetes/pull/24559 that have achieved LGTM.  

The last commit is only part that is interesting, it adds the parsing logic to handle the flags, and reserves `pkg/kubelet/eviction` for eviction manager logic.

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test/e2e/addon_update: Respect KUBE_SSH_USER

This change makes the e2e tests more consistent as the other ones all already respected this variable.

I didn't do the larger change of re-factoring it to use `framework.SSH` because getting the `scp` portion working there has some significant complexity. If I find time, I'd like to go back and do it since this test needs a little ❤

cc @yifan-gu, @kubernetes/sig-testing 

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Enable using protobufs in e2e tests

ref #25132

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Add heapster to kubemark

cc @mwielgus 

Fix protobuf failures

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Add cloud-provider setting to local-up-cluster.sh

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Add data structure for storing attach detach controller state.

This PR introduces the data structure for maintaining the in-memory state for the new attach/detach controller (#20262).

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kube-proxy userspace, enable RR if connect endpoint which is session affinity fails

for issue #24648 

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Move godeps to vendor/

This is a first-step towards glide support, maybe we don't want or need to take this, but it was easy to try.

This fails to compile, not sure why:

```
# k8s.io/kubernetes/pkg/apis/extensions/v1beta1
_output/local/go/src/k8s.io/kubernetes/pkg/apis/extensions/v1beta1/conversion_generated.go:2703: undefined: extensions.ClusterAutoscaler
_output/local/go/src/k8s.io/kubernetes/pkg/apis/extensions/v1beta1/conversion_generated.go:2703: undefined: ClusterAutoscaler
_output/local/go/src/k8s.io/kubernetes/pkg/apis/extensions/v1beta1/conversion_generated.go:2719: undefined: extensions.ClusterAutoscaler
_output/local/go/src/k8s.io/kubernetes/pkg/apis/extensions/v1beta1/conversion_generated.go:2719: undefined: ClusterAutoscaler
_output/local/go/src/k8s.io/kubernetes/pkg/apis/extensions/v1beta1/conversion_generated.go:2723: undefined: extensions.ClusterAutoscalerList
_output/local/go/src/k8s.io/kubernetes/pkg/apis/extensions/v1beta1/conversion_generated.go:2723: undefined: ClusterAutoscalerList
_output/local/go/src/k8s.io/kubernetes/pkg/apis/extensions/v1beta1/conversion_generated.go:3468: Convert_extensions_JobSpec_To_v1beta1_JobSpec redeclared in this block
	previous declaration at _output/local/go/src/k8s.io/kubernetes/pkg/apis/extensions/v1beta1/conversion.go:328
_output/local/go/src/k8s.io/kubernetes/pkg/apis/extensions/v1beta1/conversion_generated.go:3845: Convert_extensions_ScaleStatus_To_v1beta1_ScaleStatus redeclared in this block
	previous declaration at _output/local/go/src/k8s.io/kubernetes/pkg/apis/extensions/v1beta1/conversion.go:98
_output/local/go/src/k8s.io/kubernetes/pkg/apis/extensions/v1beta1/conversion_generated.go:4737: Convert_v1beta1_JobSpec_To_extensions_JobSpec redeclared in this block
	previous declaration at _output/local/go/src/k8s.io/kubernetes/pkg/apis/extensions/v1beta1/conversion.go:380
_output/local/go/src/k8s.io/kubernetes/pkg/apis/extensions/v1beta1/conversion_generated.go:5186: Convert_v1beta1_ScaleStatus_To_extensions_ScaleStatus redeclared in this block
	previous declaration at _output/local/go/src/k8s.io/kubernetes/pkg/apis/extensions/v1beta1/conversion.go:120
_output/local/go/src/k8s.io/kubernetes/pkg/apis/extensions/v1beta1/conversion_generated.go:2723: too many errors
!!! Error in /home/thockin/tmp/godep-vendor/src/k8s.io/kubernetes/hack/lib/golang.sh:417
```

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cluster/images/hyperkube: create symlink for each server

Add a kubelet symlink so that the hyperkube image can appear as a kubelet image. https://github.com/kubernetes/kubernetes/issues/24510

a) it doesn't need it

b) changing CWD to a path with symlinks breaks deep within ginkgo, where it
crafts a relative path to ../../../../../../platforms/amd64/whatever which then
traverses the physical path not the symlinked one, and breaks.

Go mistreats "testdata" and can't find vendor/ dirs.

The build is now fast enough to not need them.

Fix the licenses script and run it.

Our `realpath` and `readlink -f` functions (required only because of MacOS,
thanks Steve) were poor substitutes at best.  Mostly they were downright
broken.  This thoroughly overhauls them and adds a test (in comments, since we
don't seem to have shell tests).  For all the interesting cases I could think
of, the fakes act just like the real thing.

Then use those and canonicalize KUBE_ROOT.  In order to make recursive calls of
our shell tool not additively grow `pwd` we have to essentially make the
sourcing of init.sh idempotent.