WFLY-3805: JGroupsBroadcastGroupConfiguration Serialization Problem

Please someone take a look at this.
Does this depend on a new HornetQ release? Looking at the HQ 2.4.3 code, the "jgroupsFile" param to JGroupsBroadcastGroupConfiguration is eventually treated as a resource loadable from the TCCL:

 ```
private void initChannel(final String fileName, final String channelName) throws Exception
      {
         URL configURL = Thread.currentThread().getContextClassLoader().getResource(fileName);
```