Move pod template hash and label adding util functions to their packages.

These utilities are useful outside Deployments as well, for example
in DaemonSets for DaemonSet updates. So move them to their own util
packages.

pkg/util/pod/doc.go

@@ -0,0 +1,18 @@
+/*
+Copyright 2016 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 pod provides utilities to work with Kubernetes pod and pod templates.
+package pod

pkg/util/pod/pod.go

@@ -0,0 +1,30 @@
+/*
+Copyright 2016 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 pod
+
+import (
+	"hash/adler32"
+
+	"k8s.io/kubernetes/pkg/api"
+	hashutil "k8s.io/kubernetes/pkg/util/hash"
+)
+
+func GetPodTemplateSpecHash(template api.PodTemplateSpec) uint32 {
+	podTemplateSpecHasher := adler32.New()
+	hashutil.DeepHashObject(podTemplateSpecHasher, template)
+	return podTemplateSpecHasher.Sum32()
+}