protected void updateKerberosDescriptorArtifact(ArtifactDAO artifactDAO, ArtifactEntity artifactEntity) throws AmbariException {
    // NOOP
  }
Update the specified Kerberos Descriptor artifact to conform to the new structure.
<p/>
On ambari version update some of identities can be moved between scopes(e.g. from service to component), so
old identity need to be moved to proper place and all references for moved identity need to be updated.
<p/>
By default descriptor remains unchanged and this method must be overridden in child UpgradeCatalog to meet new
ambari version changes in kerberos descriptors.
<p/>
The supplied ArtifactEntity is updated in place a merged back into the database.

@param artifactDAO    the ArtifactDAO to use to store the updated ArtifactEntity
@param artifactEntity the ArtifactEntity to update
ambari-server/src/main/java/org/apache/ambari/server/upgrade/AbstractUpgradeCatalog.java