Fix events timeout errors

Resetting the timeout doesn't fully cut it, as it may timeout after we
got an event and be delivered later. This should fix it well enough for
the moment. https://github.com/golang/go/issues/11513

lib/events/events.go

@@ -188,12 +188,19 @@ func (s *Subscription) Poll(timeout time.Duration) (Event, error) {
 		dl.Debugln("poll", timeout)
 	}
 
-	s.timeout.Reset(timeout)
+	if !s.timeout.Reset(timeout) {
+		select {
+		case <-s.timeout.C:
+		default:
+		}
+	}
+
 	select {
 	case e, ok := <-s.events:
 		if !ok {
 			return e, ErrClosed
 		}
+		s.timeout.Stop()
 		return e, nil
 	case <-s.timeout.C:
 		return Event{}, ErrTimeout