Dynamic IP: detect the public IP changing

See https://forum.duniter.org/t/noeud-qui-pedale-dans-la-choucroute/2176

changed milestone to %2.0

Is this still usefull since WS2P allows the node to stays connected to the network with WS2P private?

It is usefull for the client API and WS2P public.

But, much less a priority.

changed milestone to %Horizon