Be smart about ASG joining, and don't try and re-join with known peers
Be smart about ASG joining, and don't try and re-join with known peers

Fixes #95

tinnightcap/nubis-consul,gozer/nubis-consul,tinnightcap/nubis-consul,Nubisproject/nubis-consul,gozer/nubis-consul,gozer/nubis-consul,Nubisproject/nubis-consul,Nubisproject/nubis-consul,limed/nubis-consul,limed/nubis-consul