Move Deployments to ReplicaSets and switch the Deployment selector to the new LabelSelector.

Update the Deployments' API types, defaulting code, conversions, helpers
and validation to use ReplicaSets instead of ReplicationControllers and
LabelSelector instead of map[string]string for selectors.

Also update the Deployment controller, registry, kubectl subcommands,
client listers package and e2e tests to use ReplicaSets and
LabelSelector for Deployments.

pkg/util/labels/labels.go

@@ -18,6 +18,8 @@ package labels
 
 import (
 	"fmt"
+
+	"k8s.io/kubernetes/pkg/apis/extensions"
 )
 
 // Clones the given map and returns a new map with the given key and value added.
@@ -51,3 +53,45 @@ func CloneAndRemoveLabel(labels map[string]string, labelKey string) map[string]s
 	delete(newLabels, labelKey)
 	return newLabels
 }
+
+// Clones the given selector and returns a new selector with the given key and value added.
+// Returns the given selector, if labelKey is empty.
+func CloneSelectorAndAddLabel(selector *extensions.LabelSelector, labelKey string, labelValue uint32) *extensions.LabelSelector {
+	if labelKey == "" {
+		// Dont need to add a label.
+		return selector
+	}
+
+	// Clone.
+	newSelector := new(extensions.LabelSelector)
+
+	// TODO(madhusudancs): Check if you can use deepCopy_extensions_LabelSelector here.
+	newSelector.MatchLabels = make(map[string]string)
+	if selector.MatchLabels != nil {
+		for key, val := range selector.MatchLabels {
+			newSelector.MatchLabels[key] = val
+		}
+	}
+	newSelector.MatchLabels[labelKey] = fmt.Sprintf("%d", labelValue)
+
+	if selector.MatchExpressions != nil {
+		newMExps := make([]extensions.LabelSelectorRequirement, len(selector.MatchExpressions))
+		for i, me := range selector.MatchExpressions {
+			newMExps[i].Key = me.Key
+			newMExps[i].Operator = me.Operator
+			if me.Values != nil {
+				newMExps[i].Values = make([]string, len(me.Values))
+				for j, val := range me.Values {
+					newMExps[i].Values[j] = val
+				}
+			} else {
+				newMExps[i].Values = nil
+			}
+		}
+		newSelector.MatchExpressions = newMExps
+	} else {
+		newSelector.MatchExpressions = nil
+	}
+
+	return newSelector
+}