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.

pkg/controller/daemon/daemon_controller_test.go

@@ -45,9 +45,9 @@ import (
 	api "k8s.io/kubernetes/pkg/apis/core"
 	"k8s.io/kubernetes/pkg/controller"
 	kubelettypes "k8s.io/kubernetes/pkg/kubelet/types"
+	"k8s.io/kubernetes/pkg/scheduler/algorithm"
 	"k8s.io/kubernetes/pkg/securitycontext"
 	labelsutil "k8s.io/kubernetes/pkg/util/labels"
-	"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm"
 )
 
 var (