TestZkChildListener listener = new TestZkChildListener();
_zkclient.subscribeChildChanges(keyBuilder.messages("localhost_12918").getPath(), listener);
MockController controller =
new MockController(_zkaddr, clusterName, "controller_0");
controller.syncStart();
// pause controller
// --enableCluster <clusterName true/false>
ClusterSetup.processCommandLineArgs(new String[] {
"--zkSvr", _zkaddr, "--enableCluster", clusterName, "false"