RGW haproxy backend return code can be 200 or 405

RGW Swift endpoint will return a 405 to httpchk.
RGW S3 endpoint will return a 200 to httpchk.

Change-Id: Ie5a9379d0823b1cdcfd67bbecb9a29ca4f262e92

inventory/group_vars/haproxy/haproxy.yml

@@ -345,5 +345,5 @@ haproxy_default_services:
       haproxy_backend_options:
         - httpchk HEAD /
       haproxy_backend_httpcheck_options:
-        - expect status 405
+        - expect rstatus 200|405
       haproxy_service_enabled: "{{ (groups['ceph-rgw'] is defined and groups['ceph-rgw'] | length > 0) or (ceph_rgws | length > 0) }}"