Nova services are now running in the containers but we still have
libvirt packages installed on Overcloud systems. This change removes
libvirt packages that are not needed any more.
Depends-On: https://review.opendev.org/702836
Change-Id: I1220eda28cb8d21098c26aa548305004567e6e03
Closes-Bug: 1842932
(cherry picked from commit 359bc74c76)