Add dependency to 'wait for resource'

Add dependency so helm is not going to access the cluster before it is up and running

Author: jantoebes

autogen/outputs.tf.tmpl

@@ -54,6 +54,7 @@ output "endpoint" {
     */
     google_container_cluster.primary,
     google_container_node_pool.pools,
+    null_resource.wait_for_cluster.id,
   ]
 }