Add openstack_node_role parameter

Add openstack_node_role parameter that will specify node role
primary|secondary. This metadata will be used by formulas as a
trigger to run one-shot operations.

Change-Id: I230590bc5f9d53960c6edaf7e37c44541d9c3342
Related-Prod: PROD-21267
diff --git a/heat/server/cluster.yml b/heat/server/cluster.yml
index 5829aee..eee2b63 100644
--- a/heat/server/cluster.yml
+++ b/heat/server/cluster.yml
@@ -22,6 +22,7 @@
       enabled: true
       region: ${_param:openstack_region}
       version: ${_param:heat_version}
+      role: ${_param:openstack_node_role}
       bind:
         api_cfn:
           address: ${_param:cluster_local_address}