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/cinder/control/single.yml b/cinder/control/single.yml
index d442693..89c5307 100644
--- a/cinder/control/single.yml
+++ b/cinder/control/single.yml
@@ -15,6 +15,7 @@
     controller:
       backend: {}
       default_volume_type: ''
+      role: ${_param:openstack_node_role}
       database:
         host: ${_param:single_address}
       identity: