protected Long ambariServerHostID(){
    String ambariServerHostName = StageUtils.getHostName();
    HostEntity ambariServerHostEntity = hostDAO.findByName(ambariServerHostName);
    return (ambariServerHostEntity == null)
        ? null
        : ambariServerHostEntity.getHostId();
  }
Adds entries to the property filter (<code>propertyFilter</code>) found in the {@link KerberosConfigurationDescriptor}s
within the specified node of the Kerberos descriptor.

@param containers     the Kerberos descriptor containers to process
@param propertyFilter the property filter map to update
@param replacements   replacement values to use when attempting to perform variable replacements on the property names
@throws AmbariException if an issue occurs while replacing variables in the property names
ambari-server/src/main/java/org/apache/ambari/server/serveraction/upgrades/PreconfigureKerberosAction.java