public static ZooKeeperCleanup getInstance(Configuration appConf) {
    if (thisclass != null) {
      return thisclass;
    }
    thisclass = new ZooKeeperCleanup(appConf);
    return thisclass;
  }
Create a cleanup object.  We use the appConfig to configure JobState.
@param appConf
hcatalog/webhcat/svr/src/main/java/org/apache/hive/hcatalog/templeton/tool/ZooKeeperCleanup.java