add easy to use dynamic client

cmd/kube-controller-manager/app/core.go

@@ -36,7 +36,6 @@ import (
 	cacheddiscovery "k8s.io/client-go/discovery/cached"
 	"k8s.io/client-go/dynamic"
 	clientset "k8s.io/client-go/kubernetes"
-	"k8s.io/kubernetes/pkg/api/legacyscheme"
 	"k8s.io/kubernetes/pkg/controller"
 	endpointcontroller "k8s.io/kubernetes/pkg/controller/endpoint"
 	"k8s.io/kubernetes/pkg/controller/garbagecollector"
@@ -294,9 +293,6 @@ func startResourceQuotaController(ctx ControllerContext) (bool, error) {
 }
 
 func startNamespaceController(ctx ControllerContext) (bool, error) {
-	// TODO: should use a dynamic RESTMapper built from the discovery results.
-	restMapper := legacyscheme.Registry.RESTMapper()
-
 	// the namespace cleanup controller is very chatty.  It makes lots of discovery calls and then it makes lots of delete calls
 	// the ratelimiter negatively affects its speed.  Deleting 100 total items in a namespace (that's only a few of each resource
 	// including events), takes ~10 seconds by default.
@@ -304,13 +300,17 @@ func startNamespaceController(ctx ControllerContext) (bool, error) {
 	nsKubeconfig.QPS *= 10
 	nsKubeconfig.Burst *= 10
 	namespaceKubeClient := clientset.NewForConfigOrDie(nsKubeconfig)
-	namespaceClientPool := dynamic.NewClientPool(nsKubeconfig, restMapper, dynamic.LegacyAPIPathResolverFunc)
 
 	discoverResourcesFn := namespaceKubeClient.Discovery().ServerPreferredNamespacedResources
 
+	dynamicClient, err := dynamic.NewForConfig(nsKubeconfig)
+	if err != nil {
+		return true, err
+	}
+
 	namespaceController := namespacecontroller.NewNamespaceController(
 		namespaceKubeClient,
-		namespaceClientPool,
+		dynamicClient,
 		discoverResourcesFn,
 		ctx.InformerFactory.Core().V1().Namespaces(),
 		ctx.ComponentConfig.NamespaceController.NamespaceSyncPeriod.Duration,