Tell Go runtime we have stopped listening to signals

If we exit the handler loop, e.g. after receiving SIGTERM, then we
don't want Go to attempt further delivery of signals.

Author: bboreham

signals/signals.go

@@ -42,6 +42,7 @@ func (h *Handler) Stop() {
 func (h *Handler) Loop() {
 	sigs := make(chan os.Signal, 1)
 	signal.Notify(sigs, syscall.SIGINT, syscall.SIGQUIT, syscall.SIGTERM)
+	defer signal.Stop(sigs)
 	buf := make([]byte, 1<<20)
 	for {
 		select {