Use case: I have a central LeProxy instance and a number of LeProxy installations with changing IP addresses (satellites). Now let the satellites connect back to the central LeProxy instance and then when a connection attempt comes in, have the central instance forward this through one of the satellites.

This allows new satellites coming up and down without requiring any particular configuration at the central instance.

Having additional controls, such as determining how one of the available proxy servers is picked is out of scope of this ticket. Perhaps we can use a fixed scheme (such as picking a random one) or limited this to a single satellite for now.