Update DML model and domain JAR file for Fénix Framework 2.2-cloudtm-SNAPSHOT

* After this update it is necessary to update the Ruby code that uses
  Agent.findByUser.  This will no longer exist.  Instead the already
  existing relation between Root and Agents is now indexed, which provides
  the method getAgentsByUser(String).  Note that this method is not static
  and, therefore, it should be invoked on the root object instance.