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Revert "Volume Plugin for Cinder; Openstack Block Storage"

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Volume Plugin for Cinder; Openstack Block Storage

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This commit merges the NamespaceExists admission controller
into the NamespaceLifecycle admission controller.

New tests were added to the NamespaceLifecycle addmission controller
tests, and the test case was fixed so that it runs without panicing.

Additionally, the NamespaceExists admission controller was marked as
deprecated in the docs.

Closes #12053

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Fixing kubelet cmd documentation for register-node argument

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Configure lower NFS grace period.

Deleting unused test code

Changed JobSucceded to JobComplete

Update development godep instructions

Add link to create a question tagged Kubernetes on Stack Overflow to the

Clean-up CoreOS documentation.

Reword introduction and requirements for build/README.md

Amend an ordered list markdown error in scratch.md

Updates fedora ansible guide

Change "chmod +X" to "chmod +x" in prereqs.md

Move E2E PD Test out of flaky

Clarify boundaries of Kubernetes.

troubleshooting doc, along with a couple other small improvements.

Fix E2E Test "Pod Disks should schedule a pod w/ a RW PD, remove it, then schedule it on another host" out of flaky

Kubelet: do not remove pod directory if any container is still running

If there are any running container in the pod, we cannot remove the volume.
Therefore, we should not attempt to remove the pod directory.

When calling kubectl.sh, allow error due to API server bouncing

Don't run flaky e2e tests in parallel test runs.

pass hostname-override through to kube-proxy (if defined)

Transfer maintainer responsibilities for fluentd configs/images.

e2e: skip restart count test