Add mechanism (for ics_hxActor) to create outgoing actor channel

The current actor framework connects out to the tron hub, then optionally sends a command for tron to connect back to the actor: this second channel is used to send commands to the actor.

As it stands, we are not allowed to have non-ssh listening sockets on the HxRG-reading host, so we need to add a mechanism for the ics_hxActor to establish both connections itself. Not terribly hard.