Add a strongly typed error for unrecognized kind/type/version

pkg/runtime/error.go

@@ -0,0 +1,27 @@
+/*
+Copyright 2014 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 runtime
+
+import (
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/conversion"
+)
+
+// IsNotRegisteredError returns true if the error indicates the provided
+// object or input data is not registered.
+func IsNotRegisteredError(err error) bool {
+	return conversion.IsNotRegisteredError(err)
+}