Use node hostname instead of hard coded ones

Change-Id: I80b7b7d3ec8134f3e22bb5f29634b8216eb7c7af
diff --git a/metadata/service/server/cluster.yml b/metadata/service/server/cluster.yml
index 81192c4..c669993 100644
--- a/metadata/service/server/cluster.yml
+++ b/metadata/service/server/cluster.yml
@@ -44,15 +44,15 @@
           - address: ${_param:cluster_vip_address}
             port: 5672
           servers:
-          - name: ctl01
+          - name: ${_param:cluster_node01_hostname}
             host: ${_param:cluster_node01_address}
             port: 5672
-            params: check inter 5000 rise 2 fall 3 
-          - name: ctl02
+            params: check inter 5000 rise 2 fall 3
+          - name: ${_param:cluster_node02_hostname}
             host: ${_param:cluster_node02_address}
             port: 5672
             params: backup check inter 5000 rise 2 fall 3
-          - name: ctl03
+          - name: ${_param:cluster_node03_hostname}
             host: ${_param:cluster_node03_address}
             port: 5672
             params: backup check inter 5000 rise 2 fall 3