move utils used in restclient to client-go

pkg/kubelet/util/cache/BUILD

@@ -22,7 +22,7 @@ go_test(
     tags = ["automanaged"],
     deps = [
         "//pkg/client/cache:go_default_library",
-        "//pkg/util/clock:go_default_library",
+        "//vendor:k8s.io/client-go/pkg/util/clock",
     ],
 )
 

pkg/kubelet/util/cache/object_cache_test.go

@@ -21,8 +21,8 @@ import (
 	"testing"
 	"time"
 
+	"k8s.io/client-go/pkg/util/clock"
 	expirationcache "k8s.io/kubernetes/pkg/client/cache"
-	"k8s.io/kubernetes/pkg/util/clock"
 )
 
 type testObject struct {