(tested) Refactor code

* merge 9d04e4c from https://github.com/jzelinskie/chihaya
* sanitize ip address on Scrape requests
* remove NewConnectionID and ValidConnectionID functions from production code

frontend/http/parser.go

@@ -178,5 +178,5 @@ func requestedIP(r *http.Request, p bittorrent.Params, opts ParseOptions) (netip
 	}
 
 	addrPort, err := netip.ParseAddrPort(r.RemoteAddr)
-	return addrPort.Addr().Unmap(), false, err
+	return addrPort.Addr(), false, err
 }