[CI] Fix cephfs-nfs job by running on centos-stream-9

Package based installation of ceph via devstack-plugin-ceph
is deprecated. Recently, we broke support for Ubuntu 20.04 LTS
(Focal Fossa) [1] because we're trying to advance all OpenStack
CI jobs to Ubuntu 22.04/Jammy Jellyfish or Centos Stream 9. The
community's plan is to retire package based installation of ceph
on devstack during the 2023.2/Bobcat release cycle, and move all
efforts onto "cephadm" [2].

With CephFS/NFS, cephadm deployment works, but seems to require
more CI resources than a single test node can afford. So, we're
working in parallel to create a multi-node job [3][4] to ensure more
stable testing without foregoing coverage. As a temporary workaround,
we can run the ceph-nfs job (which doesn't use cephadm) on
centos-9 stream.

Unfortunately, ipv6 testing would have to be turned off because of
LP bug #1998489. We'll remedy this separately.

[1] https://review.opendev.org/c/openstack/devstack-plugin-ceph/+/865315
[2] https://docs.ceph.com/en/quincy/cephadm/index.html
[3] https://review.opendev.org/c/openstack/devstack-plugin-ceph/+/876747
[4] https://review.opendev.org/c/openstack/manila/+/869235

Change-Id: I6abf7a8eb275c5b29cfe29b3a0f54de76c5bb1e8
Signed-off-by: Goutham Pacha Ravi <gouthampravi@gmail.com>
1 file changed