protected AbstractKerberosDescriptor getDescriptor(Type type, String name) {
    return null;
  }
Gets the requested AbstractKerberosDescriptor implementation using a type name and a relevant
descriptor name.
<p/>
Implementation classes should override this method to handle relevant descriptor types.

@param type a String indicating the type of the requested descriptor
@param name a String indicating the name of the requested descriptor
@return a AbstractKerberosDescriptor representing the requested descriptor or null if not found
ambari-server/src/main/java/org/apache/ambari/server/state/kerberos/AbstractKerberosDescriptor.java