Fix libvirt livemigration

Ensure qemu migration ports are open on nova_computes and ensure
that nova passes no_verify to libvirt as we don't have reasonable
way to fill known_hosts file at puppet run.

Change-Id: I484df7402032f71141b2dea356d841fcfe296e13
Closes-Bug: rhbz#1100356
Merge "Fix libvirt livemigration"