@Override
  public String toString() {
    return "ZKNodeTracker{" + "node='" + node + ", stopped=" + stopped + '}';
  }
Checks if the baseznode set as per the property 'zookeeper.znode.parent' exists.
@return true if baseznode exists. false if doesnot exists.
hbase-zookeeper/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKNodeTracker.java