Libvirt configuration for migrations in nova.

This is the libvirt part of enabling migrations in Nova. Note that the
libvirt tcp socket is unprotected, so we won't want to run this on a
network node :)

Change-Id: If9c6e9518b03b6175cb07c42794f5edbc19801f8
Add a script to deploy the ci-overcloud.

This is incomplete, pending full transcription of automation,
but something >> nothing.

Change-Id: I709b1af60a20f4e02e1a172d487cbc72fa948e7a
Merge "Libvirt configuration for migrations in nova."
Merge "Add a script to deploy the ci-overcloud."