Covert the kubelet binary to hyperkube.

This leaves `pkg/kubelet/server/server.go` looking a little ugly as there is an extra layer of "config" structs that isn't needed.  This is left as a TODO for now.

pkg/kubelet/server/plugins.go

@@ -0,0 +1,44 @@
+/*
+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 server
+
+// This file exists to force the desired plugin implementations to be linked.
+import (
+	// Credential providers
+	_ "github.com/GoogleCloudPlatform/kubernetes/pkg/credentialprovider/gcp"
+	// Volume plugins
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/volume"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/volume/empty_dir"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/volume/gce_pd"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/volume/git_repo"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/volume/host_path"
+)
+
+// ProbeVolumePlugins collects all volume plugins into an easy to use list.
+func ProbeVolumePlugins() []volume.Plugin {
+	allPlugins := []volume.Plugin{}
+
+	// The list of plugins to probe is decided by the kubelet binary, not
+	// by dynamic linking or other "magic".  Plugins will be analyzed and
+	// initialized later.
+	allPlugins = append(allPlugins, empty_dir.ProbeVolumePlugins()...)
+	allPlugins = append(allPlugins, gce_pd.ProbeVolumePlugins()...)
+	allPlugins = append(allPlugins, git_repo.ProbeVolumePlugins()...)
+	allPlugins = append(allPlugins, host_path.ProbeVolumePlugins()...)
+
+	return allPlugins
+}