Look for usable on-cluster credentials using k8schain (#243)

* dep ensure and use k8schain

* checkpoint

* fix vendoring, stuff builds

* Use k8schain for pushes too

* Use NewNoClient

* update ggcr dep

* Move k8schain usage to image_util.go

vendor/github.com/googleapis/gnostic/compiler/main.go

@@ -0,0 +1,16 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package compiler provides support functions to generated compiler code.
+package compiler