loopd: refactor into Start/Stop methods

Author: guggero

cmd/loopd/main.go

@@ -10,6 +10,6 @@ func main() {
 	cfg := loopd.RPCConfig{}
 	err := loopd.Start(cfg)
 	if err != nil {
-		fmt.Println(err)
+		fmt.Printf("loopd exited with an error: %v\n", err)
 	}
 }