Thread-per-pod model in Kubelet.

Add missing flag description; regenerate man1

Update skydns's etcd to version 2.0.3

Assert pre and post conditions of all commands in test-cmd.sh

Add Kubelet metrics for pod and container counts.

Fix delete pod namespace; include error message when failed deleting pods

Remove deprecated co-located ES/Kibana setup

Trim whitespace from kubectl in e2e/kubectl.go

Rip out the certs.sh test since the certs.go test has been stable

Part of #4604.

Add protection for the pods member varaible.

Fix typo in comment: mail -> main

#4544 - Fix inadvertent whitespace in v1beta3 enablement

Revert "Remove host ports from the update demo and update tests"

Revert "Use a different port for the kubectl proxy in the shell and go t...

Use a different port for the kubectl proxy in the shell and go tests.

`hack/test-cmd.sh` contains a list of `kubectl` commands to test.
However, the effect of the execution of those commands was not systematically
checked. As a consequence, it was possible to break a command without breaking
those tests.

This commit surrounds every single `kubectl` command with assertions on
pre and post condition.

Update examples to support v1beta3 api -hazelcast

Remove pkg/util/merge and replace with evanphx/json-patch

Extending label.Parse method to support exact match

Fix commands order & add guide in k8s-ubuntu-cluster readme

Address comments.

Fix typo: registrying -> registering

Remove host ports from the update demo and update tests

Construct path correctly in proxy