Move scheduler code out of plugin directory.

This moves plugin/pkg/scheduler to pkg/scheduler and
plugin/cmd/kube-scheduler to cmd/kube-scheduler.

Bulk of the work was done with gomvpkg, except for kube-scheduler main
package.

cmd/kube-scheduler/scheduler.go

@@ -0,0 +1,39 @@
+/*
+Copyright 2014 The Kubernetes Authors.
+
+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 main
+
+import (
+	"os"
+
+	utilflag "k8s.io/apiserver/pkg/util/flag"
+	"k8s.io/apiserver/pkg/util/logs"
+	"k8s.io/kubernetes/cmd/kube-scheduler/app"
+	_ "k8s.io/kubernetes/pkg/client/metrics/prometheus" // for client metric registration
+	_ "k8s.io/kubernetes/pkg/version/prometheus"        // for version metric registration
+)
+
+func main() {
+	command := app.NewSchedulerCommand()
+
+	utilflag.InitFlags()
+	logs.InitLogs()
+	defer logs.FlushLogs()
+
+	if err := command.Execute(); err != nil {
+		os.Exit(1)
+	}
+}