Build fix for go1.11rc1 (#6354)

Vendorized the following packages

- "github.com/rjeczalik/notify"
- "github.com/minio/highwayhash"

Fixes #6315

vendor/github.com/rjeczalik/notify/watcher_trigger.go

@@ -106,7 +106,8 @@ func newWatcher(c chan<- EventInfo) watcher {
 	}
 	t.t = newTrigger(t.pthLkp)
 	if err := t.t.Init(); err != nil {
-		panic(err)
+		t.Close()
+		return watcherStub{fmt.Errorf("failed setting up watcher: %v", err)}
 	}
 	go t.monitor()
 	return t