@Override
  public void setMetaStoreHandler(IHMSHandler handler) {
    hmap.setMetaStoreHandler(handler);
  }
InjectableDummyAuthenticator - An implementation of HiveMetastoreAuthenticationProvider
that wraps another Authenticator, but when asked to inject a user provided username
and groupnames, does so. This can be toggled back and forth to use in testing
itests/util/src/main/java/org/apache/hadoop/hive/ql/security/InjectableDummyAuthenticator.java