This change enables [workarounds]libvirt_disable_apic when devstack is
deployed using the libvirt virt driver and qemu virt type in an effort
to avoid issues outlined in bug #1939108 caused by the older kernel
currently used in Cirros 0.5.2.
Depends-On: https://review.opendev.org/c/openstack/nova/+/766043
Closes-Bug: #1939108
Change-Id: Ibb6c34133bb1c95ef11cc59d9b12a0f65502c61b