Update vendor files to point to kubernetes-1.12.0-beta.1

vendor/google.golang.org/appengine/channel/channel_test.go

@@ -0,0 +1,21 @@
+// Copyright 2015 Google Inc. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package channel
+
+import (
+	"testing"
+
+	"google.golang.org/appengine/internal"
+)
+
+func TestRemapError(t *testing.T) {
+	err := &internal.APIError{
+		Service: "xmpp",
+	}
+	err = remapError(err).(*internal.APIError)
+	if err.Service != "channel" {
+		t.Errorf("err.Service = %q, want %q", err.Service, "channel")
+	}
+}