[tor-relays] pinning relay keys to IPs (or not)

[starlight.2015q2 at binnacle.cx]

Perhaps a way to do it is reset the
consensus for a relay if its IP address
moves to a different Autonomous System.

Is rare that dynamic IP causes relays
to hop ASs (e.g. possibly SBC/ATT),
and list of exceptions could be created
for the few cases where it causes trouble.

CYMRU has a dynamic service for looking
up AS from IP.