Docker Set Container name to Instance ID

Docker has named container since 0.7. In order to make it easier for the
admin to troubleshoot and find container set the container name to the nova
instance UUID. Addtional the name is prefixed with nova.

Example: nova-d7553842-2424-4471-98a7-92a1db70033b

DocImpact - Docker driver requires Docker 0.7 or newer.

Change-Id: I4f12734663e726b08f53400fdfcfb8d31401490d
Blueprint:
https://blueprints.launchpad.net/nova/+spec/docker-name-instance-id
Merge "Docker Set Container name to Instance ID"