Update kube-dns version to 1.14.2
https://github.com/kubernetes/kubernetes/pull/45684

Make etcd_backup_prefix configurable. Ensures that backups can be stored on a different location other than ${HOST}/var/backups, say an EBS volume on AWS.

Fixes #1334

With live-restore: true, we don't need a special docker restart

Previous patch removed the step that sets live-restore
back to false, so don't try to notify that handler any more

Kubelet gets copied from hyperkube container and run locally.

Leave live-restore false to updates always pick
up new network configuration

Before restarting docker, instruct it to kill running
containers when it restarts.

Needs a second docker restart after we restore the original
behavior, otherwise the next time docker is restarted by
an operator, it will unexpectedly bring down all running
containers.

In atomic, containers are left running when docker is restarted.
When docker is restarted after the flannel config is put in place,
the docker0 interface isn't re-IPed because docker sees the running
containers and won't update the previous config.

This patch kills all the running containers after docker is stopped.
We can't simply `docker stop` the running containers, as they respawn
before we've got a chance to stop the docker daemon, so we need to
use runc to do this after dockerd is stopped.

Added full path for helm

Replace 'netcheck_tag' with 'netcheck_version' and add additional
'netcheck_server_tag' and 'netcheck_agent_tag' config options to
provide ability to use different tags for server and agent
containers.

- Fix when clauses in various places
- Update requirements.txt
- Fix README.md

Signed-off-by: Sergii Golovatiuk <sgolovatiuk@mirantis.com>

on centos.  The bootstrap tty fixup needs it.