Breakup the registry package into separate packages.

Currently all registry implementations live in a single package,
which makes it bit harder to maintain. The different registry
implementations do not follow the same coding style and naming
conventions, which makes the code harder to read.

Breakup the registry package into smaller packages based on
the registry implementation. Refactor the registry packages
to follow a similar coding style and naming convention.

This patch does not introduce any changes in behavior.

pkg/registry/registrytest/controller.go

@@ -0,0 +1,53 @@
+/*
+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 registrytest
+
+import (
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
+)
+
+// TODO: Why do we have this AND MemoryRegistry?
+type ControllerRegistry struct {
+	Err         error
+	Controllers []api.ReplicationController
+}
+
+func (r *ControllerRegistry) ListControllers() ([]api.ReplicationController, error) {
+	return r.Controllers, r.Err
+}
+
+func (r *ControllerRegistry) GetController(ID string) (*api.ReplicationController, error) {
+	return &api.ReplicationController{}, r.Err
+}
+
+func (r *ControllerRegistry) CreateController(controller api.ReplicationController) error {
+	return r.Err
+}
+
+func (r *ControllerRegistry) UpdateController(controller api.ReplicationController) error {
+	return r.Err
+}
+
+func (r *ControllerRegistry) DeleteController(ID string) error {
+	return r.Err
+}
+
+func (r *ControllerRegistry) WatchControllers(label, field labels.Selector, resourceVersion uint64) (watch.Interface, error) {
+	return nil, r.Err
+}