This enables modular libvirt daemons in CentOS so that we can test
both monolithic libvirt and modular libvirt in our CI jobs.
Depends-On: https://review.opendev.org/c/openstack/puppet-nova/+/885748
Change-Id: I2588337c013068174f10e4d39092450debece07b
(cherry picked from commit c966b23114)