[actorcore] fix incoming port logic

This issue was initially filed into JIRA by 'cloomis' at 01/Oct/15 3:53 PM as ICS-17.

The incoming port for the tron -> actor connection is hardwired in the actor's config file, and defaults to 9999. This can't scale. I think I added a scheme for it to be handled dynamically, but cannot remember the details.

As long as we don't run too many actors on one host it is not really an issue. There are two on the each BEE, so I need to fiddle the config files on those. There may be several actors on the tron host, before which this should be fixed.

Figure out what the real deal is, test, and document it.