Configure libvirt migration on the RedHat and Debian-Ubuntu

It introduces Red Hat support and fix Ubuntu / Debian libvirt
configuration to support live migrations when using libvirt nova driver.

Change-Id: I72f03316e79ce3b83959def79b86056c934ce62d
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
Merge "Configure libvirt migration on the RedHat and Debian-Ubuntu"