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.

Change-Id: I85eb45632ff229676f7c29708f4a7cc64b3d90e3