protected final void restoreHBaseSiteXML() throws IOException {
    LOG.info("Restore hbase config {} with {}", configFileUnderTestDataDir,
      backupConfigFileUnderTestDataDir);
    // restore hbase-site.xml
    Files.copy(backupConfigFileUnderTestDataDir, configFileUnderTestDataDir,
      StandardCopyOption.REPLACE_EXISTING);
  }
Restores the hbase-site.xml file that was stashed by a previous call to
{@link #replaceHBaseSiteXML()}.
@throws IOException if an I/O error occurs
hbase-server/src/test/java/org/apache/hadoop/hbase/client/AbstractTestUpdateConfiguration.java