Ubuntu cloud archive released libvirt-bin version 2.5.0 which runs vms as
libvirt-qemu user. We need to force qemu to use this user to be able to
access vm files.
Change-Id: I47ff3e3b3f9412734bdc662f14681850bf64d53f
Closes-bug: 1714421
This PS moves libvirt into its own chart - decoupling it from nova,
both making it easier to deploy and use seperately and permitting
use of other compute backends.
Partially implements: blueprint split-nova-and-neutron-infra
Change-Id: I06237157244c3cdb5503eafa01229d061b1614f0