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