[kolla][wallaby] nova_libvirt restarting causes vm shutdown

Hello, I tried to update kolla wallaby because new images has been released. During the update nova_libvirt container restarted and all vm went down. So I verified that every time I restart nova_libvirt container, all vm restarted and nova_compute reports lost connection with libvirt. In openstack installations where docker is not used, the libvirt restart does not cause vm shutdown. I opened a bug: https://bugs.launchpad.net/kolla-ansible/+bug/1941706 Ignazio