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/murano/server/single.yml b/murano/server/single.yml
index c3da9f8..938263d 100644
--- a/murano/server/single.yml
+++ b/murano/server/single.yml
@@ -6,6 +6,7 @@
     server:
       enabled: true
       version: ${_param:murano_version}
+      role: ${_param:openstack_node_role}
       bind:
         address: ${_param:single_address}
         port: 8082