WFLY-3805: JGroupsBroadcastGroupConfiguration Serialization Problem

Please someone take a look at this.
That's not the same.

Here's what the old code calls:

https://github.com/wildfly/wildfly/blob/master/clustering/jgroups/src/main/java/org/jboss/as/clustering/jgroups/JChannelFactory.java#L72

Here's what the new code calls (the JChannel constructor just calls this method):

https://github.com/belaban/JGroups/blob/master/src/org/jgroups/JChannel.java#L842

The old code is doing a lot of stuff related to properly managing a channel as an integrated resource inside an appserver. The new code is just creating a channel.