Updated openstack/openstack
Project: openstack/nova  d946915e062adc37453ecb4f1874b2faae189ce9

libvirt: start lxc from block device

Currently, lxc containers can be started only from an image.
Adding support to start lxc containers from block device volumes.

Separating the lxc disk handling code from _create_domain to _lxc_disk_handler
that will use block_device_mapping and will handle the pre and post lxc start
actions on the disk, both for images and volumes.

Implements blueprint libvirt-start-lxc-from-block-devices
Change-Id: Ia980f65384af2818f46d2e91df46f131b2ce3a77