Adding Perl client to list of User Libs

Adding a link to Net::Kubernetes perl module to list of user contributed client libraries

Log any suspicious kubelet latency metrics from density e2e

kubectl log->logs in bash completions

Fix environment document about DNS and service IP

Updating heapster to v0.14.3.

Bump ectd client and fix initializing IP/Port allocators when etcd is not reachable

Be more judicious about cleaning up service account tokens

Fix the label selector for Elasticsearch logging pods

The kubectl log command switched to logs. But the bash completions code
was still looking for a singular

fix bash typo in jenkins/e2e.sh

remove references to v1beta3 in phabricator example

based on #9966: fix annoying 'please check...' messages; remove v1beta1&2 ref

yet another special case for e2e script

improve kubectl create --validate, aggregate errors and handle requir…

kubelet: clean up tests

fix broken integration tests

Merge release 0.19.1 to master

This cleans up the kubelet tests. Almost no docker specified tests now.

Update the fakeOptionGenerator to create the pod container directory,
so that fake docker client can see and record the termination log path.

Also refactor TestPortForward() to be neutral to container runtime.

Node upgrade test

fix master precommit hook

Minor fixups to iSCSI example.

add links to unlinked documents; move making-release-notes.md to devel

Fixed formatting of unmount error message

- Put the link for setting up the target before initiator link.
- Add a comment about removing the partition created in the linked
  tutorial.
- Change the settings in the pod to resemble those you would if you
  follow the tutorial
Signed-off-by: Sami Wagiaalla <swagiaal@redhat.com>