Upgrade k8s.io/client-go to version 2

vendor/k8s.io/client-go/pkg/runtime/extension.go

@@ -0,0 +1,48 @@
+/*
+Copyright 2014 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.
+*/
+
+package runtime
+
+import (
+	"encoding/json"
+	"errors"
+)
+
+func (re *RawExtension) UnmarshalJSON(in []byte) error {
+	if re == nil {
+		return errors.New("runtime.RawExtension: UnmarshalJSON on nil pointer")
+	}
+	re.Raw = append(re.Raw[0:0], in...)
+	return nil
+}
+
+// Marshal may get called on pointers or values, so implement MarshalJSON on value.
+// http://stackoverflow.com/questions/21390979/custom-marshaljson-never-gets-called-in-go
+func (re RawExtension) MarshalJSON() ([]byte, error) {
+	if re.Raw == nil {
+		// TODO: this is to support legacy behavior of JSONPrinter and YAMLPrinter, which
+		// expect to call json.Marshal on arbitrary versioned objects (even those not in
+		// the scheme). pkg/kubectl/resource#AsVersionedObjects and its interaction with
+		// kubectl get on objects not in the scheme needs to be updated to ensure that the
+		// objects that are not part of the scheme are correctly put into the right form.
+		if re.Object != nil {
+			return json.Marshal(re.Object)
+		}
+		return []byte("null"), nil
+	}
+	// TODO: Check whether ContentType is actually JSON before returning it.
+	return re.Raw, nil
+}