@After
  public void teardown() throws AmbariException, SQLException {
    H2DatabaseCleaner.clearDatabaseAndStopPersistenceService(injector);
  }
Creates 1 host and add it to the cluster.

@throws Exception
ambari-server/src/test/java/org/apache/ambari/server/state/cluster/ServiceComponentHostConcurrentWriteDeadlockTest.java