Large refactoring/feature commit

1. Change listen addresses to URIs
2. Break out connectionSvc to support listeners and dialers based on schema
3. Add relay announcement and lookups part of discovery service

cmd/stfinddevice/main.go

@@ -21,11 +21,11 @@ func main() {
 
 	var server string
 
-	flag.StringVar(&server, "server", "udp4://announce.syncthing.net:22026", "Announce server")
+	flag.StringVar(&server, "server", "udp4://announce.syncthing.net:22027", "Announce server")
 	flag.Parse()
 
 	if len(flag.Args()) != 1 || server == "" {
-		log.Printf("Usage: %s [-server=\"udp4://announce.syncthing.net:22026\"] <device>", os.Args[0])
+		log.Printf("Usage: %s [-server=\"udp4://announce.syncthing.net:22027\"] <device>", os.Args[0])
 		os.Exit(64)
 	}
 
@@ -35,9 +35,13 @@ func main() {
 		os.Exit(1)
 	}
 
-	discoverer := discover.NewDiscoverer(protocol.LocalDeviceID, nil)
+	discoverer := discover.NewDiscoverer(protocol.LocalDeviceID, nil, nil)
 	discoverer.StartGlobal([]string{server}, 1)
-	for _, addr := range discoverer.Lookup(id) {
-		log.Println(addr)
+	addresses, relays := discoverer.Lookup(id)
+	for _, addr := range addresses {
+		log.Println("address:", addr)
+	}
+	for _, addr := range relays {
+		log.Println("relay:", addr)
 	}
 }