Allow a configurable approach for setting the default resource adaptor name on MDB within a runtime (ex: AS, EAP).

The default resource adaptor names currently is set in EJB3 code to jms-ra.rar. Instead, it's the runtime environment which should set this default value. So for AS 6, once it moves to HornetQ, it can set it to the HornetQ resource adaptor name and for EAP-5, it can be set to the jms-ra.rar.

See the referenced forum thread for details.