Allow garbage collection to work against different API prefixes

The GC needs to build clients based only on Resource or Kind. Hoist the
restmapper out of the controller and the clientpool, support a new
ClientForGroupVersionKind and ClientForGroupVersionResource, and use the
appropriate one in both places.

test/e2e/framework/framework.go

@@ -34,6 +34,7 @@ import (
 	apierrs "k8s.io/kubernetes/pkg/api/errors"
 	"k8s.io/kubernetes/pkg/api/unversioned"
 	"k8s.io/kubernetes/pkg/api/v1"
+	"k8s.io/kubernetes/pkg/apimachinery/registered"
 	"k8s.io/kubernetes/pkg/client/clientset_generated/release_1_5"
 	"k8s.io/kubernetes/pkg/client/restclient"
 	"k8s.io/kubernetes/pkg/client/typed/dynamic"
@@ -197,7 +198,7 @@ func (f *Framework) BeforeEach() {
 		clientRepoConfig := getClientRepoConfig(config)
 		f.StagingClient, err = staging.NewForConfig(clientRepoConfig)
 		Expect(err).NotTo(HaveOccurred())
-		f.ClientPool = dynamic.NewClientPool(config, dynamic.LegacyAPIPathResolverFunc)
+		f.ClientPool = dynamic.NewClientPool(config, registered.RESTMapper(), dynamic.LegacyAPIPathResolverFunc)
 	}
 
 	if f.federated {