Add conversion functions.

This is needed for Job because it uses PodSpec and PodSpec
does not have auto-generatable conversion for some reason.

Copied pkg/apis/extensions/v1beta1/conversion.go, and removed
non-Job things.

pkg/apis/batch/v1/conversion.go

@@ -0,0 +1,63 @@
+/*
+Copyright 2015 The Kubernetes Authors 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 v1
+
+import (
+	"fmt"
+
+	"k8s.io/kubernetes/pkg/api"
+	v1 "k8s.io/kubernetes/pkg/api/v1"
+	"k8s.io/kubernetes/pkg/conversion"
+	"k8s.io/kubernetes/pkg/runtime"
+)
+
+func addConversionFuncs(scheme *runtime.Scheme) {
+	// Add non-generated conversion functions
+	err := scheme.AddConversionFuncs(
+		Convert_api_PodSpec_To_v1_PodSpec,
+		Convert_v1_PodSpec_To_api_PodSpec,
+	)
+	if err != nil {
+		// If one of the conversion functions is malformed, detect it immediately.
+		panic(err)
+	}
+
+	err = api.Scheme.AddFieldLabelConversionFunc("batch/v1", "Job",
+		func(label, value string) (string, string, error) {
+			switch label {
+			case "metadata.name", "metadata.namespace", "status.successful":
+				return label, value, nil
+			default:
+				return "", "", fmt.Errorf("field label not supported: %s", label)
+			}
+		})
+	if err != nil {
+		// If one of the conversion functions is malformed, detect it immediately.
+		panic(err)
+	}
+}
+
+// The following two PodSpec conversions functions where copied from pkg/api/conversion.go
+// for the generated functions to work properly.
+// This should be fixed: https://github.com/kubernetes/kubernetes/issues/12977
+func Convert_api_PodSpec_To_v1_PodSpec(in *api.PodSpec, out *v1.PodSpec, s conversion.Scope) error {
+	return v1.Convert_api_PodSpec_To_v1_PodSpec(in, out, s)
+}
+
+func Convert_v1_PodSpec_To_api_PodSpec(in *v1.PodSpec, out *api.PodSpec, s conversion.Scope) error {
+	return v1.Convert_v1_PodSpec_To_api_PodSpec(in, out, s)
+}