rolling_update: fix upgrade when using fqdn
rolling_update: fix upgrade when using fqdn

CLusters that were deployed using 'mon_use_fqdn' have a different unit
name, so during the upgrade this must be used otherwise the upgrade will
fail, looking for a unit that does not exist.

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1597516
Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

fgal/ceph-ansible,fgal/ceph-ansible,ceph/ceph-ansible,ceph/ceph-ansible