Make PeerConnection an Interface.
Make PeerConnection an Interface.

This is used by the forthcoming new Churn in uproxy-networking.

jpevarnek/uproxy,uProxy/uproxy,uProxy/uproxy,uProxy/uproxy,jpevarnek/uproxy,jpevarnek/uproxy,jpevarnek/uproxy,uProxy/uproxy,uProxy/uproxy,jpevarnek/uproxy