This patch adds a new variable `openstack_hosts_apt_pinned_packages`
which defaults to pinning ceph packages from the UCA repository to
a lower priority than the equivalent packages from the main ubuntu
repository.
Without this change, installing lxc-templates will pull packages from
the Quincy release of Ceph via Yoga UCA, and this is ahead of the
Pacific version expected by the ceph_client and ceph-ansible code.
This change improves consistency of the ceph packages installed across
the deployment and does not allow very new packages in UCA to later
cause a package downgrade failure when the ceph_client/ceph-ansible
attempts to install the well-defined version of ceph required by
openstack-ansible.
Depends-On: https://review.opendev.org/c/openstack/openstack-ansible/+/838762
Change-Id: Ia19ba6bae3e95ceb2e517039fbbfb9346e014961
2fa0318c73