config: only add related rgw section
config: only add related rgw section

there's no need to add each rgw section on all rgw nodes.
With this commit, only related rgw section are rendered.

Signed-off-by: Guillaume Abrioux <30a9df5a0293a6108675377fa1673f7aa713f915@redhat.com>

ceph/ceph-ansible,ceph/ceph-ansible