Invert api and api/v1beta1 dependencies

This is some cleanup that has been needed for a while.
There's still one more step that could usefully be done, which is to
split up our api package into the part that provides the helper
functions and the part that provides the internal types. That can come
later.

The v1beta1 package is now a good example of what an api plugin should
do to version its types.

pkg/api/conversion.go

@@ -1,83 +0,0 @@
-/*
-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 api
-
-import (
-	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/v1beta1"
-)
-
-func init() {
-	// TODO: Consider inverting dependency chain-- imagine v1beta1 package
-	// registering all of these functions. Then, if you want to be able to understand
-	// v1beta1 objects, you just import that package for its side effects.
-	AddConversionFuncs(
-		// EnvVar's Key is deprecated in favor of Name.
-		func(in *EnvVar, out *v1beta1.EnvVar) error {
-			out.Value = in.Value
-			out.Key = in.Name
-			out.Name = in.Name
-			return nil
-		},
-		func(in *v1beta1.EnvVar, out *EnvVar) error {
-			out.Value = in.Value
-			if in.Name != "" {
-				out.Name = in.Name
-			} else {
-				out.Name = in.Key
-			}
-			return nil
-		},
-
-		// Path & MountType are deprecated.
-		func(in *VolumeMount, out *v1beta1.VolumeMount) error {
-			out.Name = in.Name
-			out.ReadOnly = in.ReadOnly
-			out.MountPath = in.MountPath
-			out.Path = in.MountPath
-			out.MountType = "" // MountType is ignored.
-			return nil
-		},
-		func(in *v1beta1.VolumeMount, out *VolumeMount) error {
-			out.Name = in.Name
-			out.ReadOnly = in.ReadOnly
-			if in.MountPath == "" {
-				out.MountPath = in.Path
-			} else {
-				out.MountPath = in.MountPath
-			}
-			return nil
-		},
-
-		// MinionList.Items had a wrong name in v1beta1
-		func(in *MinionList, out *v1beta1.MinionList) error {
-			Convert(&in.JSONBase, &out.JSONBase)
-			Convert(&in.Items, &out.Items)
-			out.Minions = out.Items
-			return nil
-		},
-		func(in *v1beta1.MinionList, out *MinionList) error {
-			Convert(&in.JSONBase, &out.JSONBase)
-			if len(in.Items) == 0 {
-				Convert(&in.Minions, &out.Items)
-			} else {
-				Convert(&in.Items, &out.Items)
-			}
-			return nil
-		},
-	)
-
-}