@After
  public void teardown() throws AmbariException, SQLException {
    H2DatabaseCleaner.clearDatabaseAndStopPersistenceService(injector);
  }
Tests that for every upgrade pack found, that all referenced configuration
IDs exist in the {@code config-upgrade.xml} which will be used/created. Also
ensures that every XML file is valid against its XSD.
ambari-server/src/test/java/org/apache/ambari/server/state/stack/ConfigUpgradeValidityTest.java