Change parameter names for ceph radosgw

There are use cases when backend for rgw lives on separate node, in this case
we have have ability to override it on controller node, as haproxy leaves there.
It was done by https://gerrit.mcp.mirantis.net/#/c/17919/.
However it leads to situation of cyclic assignment of variables, with is not
compatible with 'new' reclass.

To avoid cyclic assignment this patch drops defaults for the followin variables
as they still defined in cookiecutter and static models.
Change-Id: Ib382f2dc6f77a6d02ae7231610c0385be526fe9c
diff --git a/haproxy/proxy/listen/radosgw.yml b/haproxy/proxy/listen/radosgw.yml
index 434555d..350abbf 100644
--- a/haproxy/proxy/listen/radosgw.yml
+++ b/haproxy/proxy/listen/radosgw.yml
@@ -2,12 +2,12 @@
   _param:
     haproxy_radosgw_bind_port: 8080
     haproxy_radosgw_source_port: 8080
-    ceph_rgw_node01_hostname: ${_param:cluster_node01_hostname}
-    ceph_rgw_node02_hostname: ${_param:cluster_node02_hostname}
-    ceph_rgw_node03_hostname: ${_param:cluster_node03_hostname}
-    ceph_rgw_node01_address: ${_param:cluster_node01_address}
-    ceph_rgw_node02_address: ${_param:cluster_node02_address}
-    ceph_rgw_node03_address: ${_param:cluster_node03_address}
+    haproxy_ceph_rgw_node01_hostname: ${_param:cluster_node01_hostname}
+    haproxy_ceph_rgw_node02_hostname: ${_param:cluster_node02_hostname}
+    haproxy_ceph_rgw_node03_hostname: ${_param:cluster_node03_hostname}
+    haproxy_ceph_rgw_node01_address: ${_param:cluster_node01_address}
+    haproxy_ceph_rgw_node02_address: ${_param:cluster_node02_address}
+    haproxy_ceph_rgw_node03_address: ${_param:cluster_node03_address}
   haproxy:
     proxy:
       listen:
@@ -18,15 +18,15 @@
             - address: ${_param:cluster_vip_address}
               port: ${_param:haproxy_radosgw_bind_port}
           servers:
-            - name: ${_param:ceph_rgw_node01_hostname}
-              host: ${_param:ceph_rgw_node01_address}
+            - name: ${_param:haproxy_ceph_rgw_node01_hostname}
+              host: ${_param:haproxy_ceph_rgw_node01_address}
               port: ${_param:haproxy_radosgw_source_port}
               params: check
-            - name: ${_param:ceph_rgw_node02_hostname}
-              host: ${_param:ceph_rgw_node02_address}
+            - name: ${_param:haproxy_ceph_rgw_node02_hostname}
+              host: ${_param:haproxy_ceph_rgw_node02_address}
               port: ${_param:haproxy_radosgw_source_port}
               params: check
-            - name: ${_param:ceph_rgw_node03_hostname}
-              host: ${_param:ceph_rgw_node03_address}
+            - name: ${_param:haproxy_ceph_rgw_node03_hostname}
+              host: ${_param:haproxy_ceph_rgw_node03_address}
               port: ${_param:haproxy_radosgw_source_port}
               params: check