public static HelixControllerManager populateZkInfoAndStartController(String zkConnectString, String vcrClusterName,
      ClusterMap clusterMap) {
    return populateZkInfoAndStartController(zkConnectString, vcrClusterName, clusterMap, OnlineOfflineSMD.name);
  }
Populate info on ZooKeeper server and start {@link HelixControllerManager}.
@param zkConnectString zk connect string to zk server.
@param vcrClusterName the vcr cluster name.
@param clusterMap the {@link ClusterMap} to use.
@return the created {@link HelixControllerManager}.
ambry-vcr/src/test/java/com/github/ambry/vcr/VcrTestUtil.java