This is will allow the openstack/nova project to facilitate a minimum
required version bump of QEMU and libvirt within the libvirt virt driver
in I8e349849db0b1a540d295c903f1470917b82fd97 ahead of the planned switch
to focal later in Victoria.
NOTE(lyarwood): This also has to be backported to stable/ussuri to allow
grenade to pass on master. Otherwise we don't install the required UCA
provided versions of QEMU and libvirt during the initial deploy, cauing
n-cpu to fail to start after the upgrade.
Change-Id: I85eb45632ff229676f7c29708f4a7cc64b3d90e3
(cherry picked from commit 7f7f488bc3)