Add role to aodh and panko

Change-Id: I3733a0d0b6cc392468dbf426604be07ef3725d2d
diff --git a/aodh/server/cluster.yml b/aodh/server/cluster.yml
index 91ebe12..d1f6583 100644
--- a/aodh/server/cluster.yml
+++ b/aodh/server/cluster.yml
@@ -9,6 +9,7 @@
   aodh:
     server:
       enabled: true
+      role: ${_param:openstack_node_role}
       version: ${_param:aodh_version}
       cluster: true
       ttl: 86400