peer relation without public interface

[Tilman Baumann]

On 13.01.2017 17:44, Tilman Baumann wrote:
> I thought about it a little and I do think a no-op interface purely for
> peer discovery could actually help others with similar requiremrnts too.
> Hence this https://github.com/tbaumann/charm-interface-peer-discovery
> 
> If there are no objections, I will try to get this published.

I might have used some unusual nomenclature for the states.
.connected, .departed and .available is probably more standard.