Refactor util clock into it's own pkg

pkg/kubelet/util/queue/work_queue.go

@@ -21,7 +21,7 @@ import (
 	"time"
 
 	"k8s.io/kubernetes/pkg/types"
-	"k8s.io/kubernetes/pkg/util"
+	"k8s.io/kubernetes/pkg/util/clock"
 )
 
 // WorkQueue allows queuing items with a timestamp. An item is
@@ -34,14 +34,14 @@ type WorkQueue interface {
 }
 
 type basicWorkQueue struct {
-	clock util.Clock
+	clock clock.Clock
 	lock  sync.Mutex
 	queue map[types.UID]time.Time
 }
 
 var _ WorkQueue = &basicWorkQueue{}
 
-func NewBasicWorkQueue(clock util.Clock) WorkQueue {
+func NewBasicWorkQueue(clock clock.Clock) WorkQueue {
 	queue := make(map[types.UID]time.Time)
 	return &basicWorkQueue{queue: queue, clock: clock}
 }