client-go: add canonical import comment

Kubernetes-commit: 90a555545e8ac6b286993be73b6b1571ec092801

kubernetes/BUILD

@@ -12,6 +12,7 @@ go_library(
     srcs = [
         "clientset.go",
         "doc.go",
+        "import.go",
     ],
     tags = ["automanaged"],
     deps = [

kubernetes/import.go

@@ -0,0 +1,19 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+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.
+*/
+
+// This file exists to enforce this clientset's vanity import path.
+
+package kubernetes // import "k8s.io/client-go/kubernetes"