address lavalamp's comments

pkg/client/unversioned/fake/fake.go

@@ -14,6 +14,8 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+// This is made a separate package and should only be imported by tests, because
+// it imports testapi
 package fake
 
 import (

pkg/client/unversioned/helper.go

@@ -33,7 +33,6 @@ import (
 	"github.com/golang/glog"
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/api/latest"
-	"k8s.io/kubernetes/pkg/api/registered"
 	"k8s.io/kubernetes/pkg/runtime"
 	"k8s.io/kubernetes/pkg/util"
 	"k8s.io/kubernetes/pkg/util/sets"
@@ -142,7 +141,7 @@ func New(c *Config) (*Client, error) {
 		return nil, err
 	}
 
-	if len(registered.GroupVersionsForGroup("experimental")) == 0 {
+	if _, err := latest.Group("experimental"); err != nil {
 		return &Client{RESTClient: client, ExperimentalClient: nil}, nil
 	}
 	experimentalConfig := *c

pkg/client/unversioned/import_known_versions.go

@@ -16,6 +16,7 @@ limitations under the License.
 
 package unversioned
 
+// These imports are the API groups the client will support.
 import (
 	_ "k8s.io/kubernetes/pkg/api/install"
 	_ "k8s.io/kubernetes/pkg/expapi/install"