Updated openstack/openstack
Project: openstack/nova  d3af78a42bc7a1ae70de586adf969dbf9e6f3fc7

libvirt: speed up get_all_block_devices method

Switch the get_all_block_devices method to use the new
list_instance_domains method.

Blueprint: libvirt-domain-listing-speedup
Change-Id: I8d3fdcbbe5539370583ace6abaffa62fec457d7b