Stop including arch-specific binaries in kubernetes.tar.gz

[ixdy]

What this PR does / why we need it:
This PR stops including the kubernetes client and server tarballs in kubernetes.tar.gz. These should instead be downloaded separately for only the required architectures.

The cluster/get-kube.sh (https://get.k8s.io) and cluster/get-kube-binaries.sh handle downloading and extracting the necessary binaries for you automatically. Jenkins also uses this workflow now.

Anyone still expecting binaries in kubernetes.tar.gz will be broken, but I've at least fixed all occurrences in-tree.

Which issue this PR fixes: fixes #28629, chips away at #28435

Release note:

Arch-specific server and client binaries are no longer included in `kubernetes.tar.gz`. You must manually download the necessary architecture-specific tarballs or use `kubernetes/cluster/get-kube-binaries.sh` to download them for you.

cc @luxas @zmerlynn @justinsb @mikedanese @thockin @spxtr

---

This change is

[ixdy]

For comparison:

$ gsutil ls -lh gs://kubernetes-release-dev/ci-cross/v1.5.0-alpha.1.1025+cfdaf18277e1eb/kubernetes.tar.gz
839.87 MiB  2016-10-27T06:41:49Z  gs://kubernetes-release-dev/ci-cross/v1.5.0-alpha.1.1025+cfdaf18277e1eb/kubernetes.tar.gz
$ gsutil ls -lh gs://kubernetes-release-dev/ci/v1.4.5-beta.0.47+833455c19472f7/kubernetes.tar.gz
  1.01 GiB  2016-10-27T22:56:26Z  gs://kubernetes-release-dev/ci/v1.4.5-beta.0.47+833455c19472f7/kubernetes.tar.gz
$ du -sh _output/release-tars/kubernetes.tar.gz 
4.6M    _output/release-tars/kubernetes.tar.gz

[k8s-ci-robot]

Jenkins Kubemark GCE e2e failed for commit 6d2b25fb3f42a9860a4d26deb148ac7f47786086. Full PR test history.

The magic incantation to run this job again is @k8s-bot kubemark e2e test this. Please help us cut down flakes by linking to an open flake issue when you hit one in your PR.

[k8s-ci-robot]

Jenkins GKE smoke e2e failed for commit 6d2b25fb3f42a9860a4d26deb148ac7f47786086. Full PR test history.

The magic incantation to run this job again is @k8s-bot cvm gke e2e test this. Please help us cut down flakes by linking to an open flake issue when you hit one in your PR.

[ixdy]

yeah, yeah.

tar: /var/lib/jenkins/workspace/pull-kubernetes-e2e-gke-gci/go/src/k8s.io/kubernetes/_output/release-stage/full/kubernetes/cluster/gce: Cannot open: No such file or directory

Changing /final/ back to /full/, even though this isn't really "full" anymore.

[ixdy]

Announcement posted on kubernetes-dev.

[david-mcmahon]

Still /lgtm.

[luxas]

As long as this doesn't break GCS paths, I'm OK with it.
Never used the tarballs anyway :)

[ixdy]

@luxas yep, the only thing changing is kubernetes.tar.gz.

[k8s-github-robot]

@k8s-bot test this [submit-queue is verifying that this PR is safe to merge]

[k8s-ci-robot]

Jenkins GCI GKE smoke e2e failed for commit 8ab452c. Full PR test history.

The magic incantation to run this job again is @k8s-bot gci gke e2e test this. Please help us cut down flakes by linking to an open flake issue when you hit one in your PR.

[k8s-github-robot]

Automatic merge from submit-queue