private void uninstallComponent(String service, String component, String host) throws KerberosMissingAdminCredentialsException {
    kerberosIdentityCleaner.componentRemoved(new ServiceComponentUninstalledEvent(CLUSTER_ID, "any", "any", service, component, host, false, false, -1l));
  }
Ensures that when an upgrade is in progress, new requests are not created
to remove identities since it would interfere with the long running
upgrade.

@throws Exception
ambari-server/src/test/java/org/apache/ambari/server/controller/utilities/KerberosIdentityCleanerTest.java