add delete precondition

pkg/registry/controller/etcd/etcd.go

@@ -97,6 +97,7 @@ func NewREST(opts generic.RESTOptions) (*REST, *StatusREST) {
 
 		// Used to validate controller updates
 		UpdateStrategy: controller.Strategy,
+		DeleteStrategy: controller.Strategy,
 
 		Storage: storageInterface,
 	}

pkg/registry/controller/etcd/etcd_test.go

@@ -118,11 +118,6 @@ func TestUpdate(t *testing.T) {
 			return object
 		},
 		// invalid updateFunc
-		func(obj runtime.Object) runtime.Object {
-			object := obj.(*api.ReplicationController)
-			object.UID = "newUID"
-			return object
-		},
 		func(obj runtime.Object) runtime.Object {
 			object := obj.(*api.ReplicationController)
 			object.Name = ""