rgw: disable legacy rgw service unit

rgw: disable legacy rgw service unit

When upgrading from OSP11 to OSP12 container, ceph-ansible attempts to
disable the RGW service provided by the overcloud image. The task
attempts to stop/disable ceph-rgw@{{ ansible-hostname }} and
ceph-radosgw@{{ ansible-hostname }}.service. The actual service name is
ceph-radosgw@radosgw.$name

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1525209
Signed-off-by: Sébastien Han <seb@redhat.com>
(cherry picked from commit ad54e19262f3d523ad57ee39e64d6927b0c21dea)
Signed-off-by: Sébastien Han <seb@redhat.com>