@Override
  public Configuration getConf() {
    return conf;
  }
Cleaner for the {@link MaterializationsRebuildLockHandler}. It removes outdated locks
in the intervals specified by the input property.
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/MaterializationsRebuildLockCleanerTask.java