Typo fix for radosgw@ systemd file
Typo fix for radosgw@ systemd file

systemd script for radosgw is radosgw@ not rgw@, the directory needs to
match the path.

(cherry picked from commit 05a1f965c8dd342e2643286d0228b5352f5afd36)

fgal/ceph-ansible,fgal/ceph-ansible