protected KerberosDescriptor getKerberosDescriptor(Cluster cluster, boolean includePreconfigureData)
      throws AmbariException {
    return getKerberosHelper().getKerberosDescriptor(cluster, includePreconfigureData);
  }
Calls {@link KerberosHelper#getKerberosDescriptor(Cluster, boolean)}

@param cluster                 cluster instance
@param includePreconfigureData <code>true</code> to include the preconfigure data; <code>false</code> otherwise
@return the kerberos descriptor associated with the specified cluster
@throws AmbariException if unable to obtain the descriptor
@see KerberosHelper#getKerberosDescriptor(Cluster, boolean)
ambari-server/src/main/java/org/apache/ambari/server/serveraction/kerberos/PrepareKerberosIdentitiesServerAction.java