In some cases it may be desirable to run libvirt daemon on the host. For
example, when mixing host and container OS distributions.

This change makes it possible to disable the nova_libvirt container, by
setting kolla_enable_nova_libvirt_container to false.

The stackhpc.libvirt-host role is used in order to install and configure
a libvirt daemon on compute hosts when
kolla_enable_nova_libvirt_container is false.

Depends-On: https://review.opendev.org/c/openstack/kolla-ansible/+/825357
Depends-On: https://review.opendev.org/c/openstack/kayobe-config-dev/+/829225
Depends-On: https://github.com/stackhpc/ansible-role-libvirt-host/pull/51

Story: 2009858
Task: 44495

Change-Id: I73fef63fb886a9d543d2f4231fb009523495edb3