public Path createRootDir() throws IOException {
    return createRootDir(false);
  }
Same as {@link HBaseTestingUtility#createRootDir(boolean create)} except that
<code>create</code> flag is false.
@return Fully qualified path to hbase root dir
hbase-testing-util/src/main/java/org/apache/hadoop/hbase/HBaseTestingUtility.java