Increase retries for keystone_add_service

This is the first role to run after apache/keystone are restarted
so we need to wait for them both to come up, by having a large number
of retries on the first task.

Related to: #353

rpc_deployment/roles/keystone_add_service/tasks/main.yml

@@ -24,7 +24,8 @@
     description="{{ service_description }}"
   register: add_service
   until: add_service|success
-  retries: 3
+  retries: 30
+  delay: 2
 
 # Create an admin user
 - name: Ensure Keystone user