public boolean cleanupTestDir(final String subdir) {
    if (this.dataTestDir == null) {
      return false;
    }
    return deleteDir(new File(this.dataTestDir, subdir));
  }
@param subdir Test subdir name.
@return True if we removed the test dir
hbase-testing-util/src/main/java/org/apache/hadoop/hbase/HBaseCommonTestingUtility.java