Make instance address parametrizable

Change-Id: I964fc029c801f3d91376397f8a2b0f6ac9862b49
diff --git a/metadata/service/cluster/single.yml b/metadata/service/cluster/single.yml
index a1a6c49..e22162d 100644
--- a/metadata/service/cluster/single.yml
+++ b/metadata/service/cluster/single.yml
@@ -6,6 +6,7 @@
   _param:
     keepalived_vip_virtual_router_id: 100
     keepalived_vip_password: password
+    keepalived_vip_address: ${_param:cluster_vip_address}
     keepalived_vip_interface: eth0
   keepalived:
     cluster:
@@ -15,5 +16,5 @@
           priority: ${_param:keepalived_vip_priority}
           virtual_router_id: ${_param:keepalived_vip_virtual_router_id}
           password: ${_param:keepalived_vip_password}
-          address: ${_param:cluster_vip_address}
+          address: ${_param:keepalived_vip_address}
           interface: ${_param:keepalived_vip_interface}