public boolean cleanupDataTestDirOnTestFS() throws IOException {
    boolean ret = getTestFileSystem().delete(dataTestDirOnTestFS, true);
    if (ret) dataTestDirOnTestFS = null;
    return ret;
  }
Cleans the test data directory on the test filesystem.
@return True if we removed the test dirs
hbase-testing-util/src/main/java/org/apache/hadoop/hbase/HBaseTestingUtility.java