Add flag to assert that puppet manages the keystone endpoints

This will be read by the client and it will furtherly skip the post-config.

Depends-On: I36e1c478e7c92be61da6a0d710e9025d4d354072
Depends-On: Ibbbe1e016e7e47ea5577de33c5a11d4088811616
Change-Id: Icfb650a1dff704cdcce7349dfb612298d38f2706

overcloud.yaml

@@ -1049,6 +1049,9 @@ resources:
       RoleData: {get_attr: [CephStorageServiceChain, role_data]}
 
 outputs:
+  ManagedEndpoints:
+    description: Asserts that the keystone endpoints have been provisioned.
+    value: true
   KeystoneURL:
     description: URL for the Overcloud Keystone service
     value: {get_attr: [EndpointMap, endpoint_map, KeystonePublic, uri]}