Remove TPR remnants

There are still TPR types and generated client
in the extensions group. It is better to clean
that up, now that it has been removed from master.

pkg/kubectl/scheme/install.go

@@ -81,9 +81,6 @@ func init() {
 				"PodProxyOptions",
 				"NodeProxyOptions",
 				"ServiceProxyOptions",
-				"ThirdPartyResource",
-				"ThirdPartyResourceData",
-				"ThirdPartyResourceList",
 			),
 		},
 		announced.VersionToSchemeFunc{
@@ -205,7 +202,7 @@ func init() {
 		&announced.GroupMetaFactoryArgs{
 			GroupName:              extensionsv1beta1.GroupName,
 			VersionPreferenceOrder: []string{extensionsv1beta1.SchemeGroupVersion.Version},
-			RootScopedKinds:        sets.NewString("PodSecurityPolicy", "ThirdPartyResource"),
+			RootScopedKinds:        sets.NewString("PodSecurityPolicy"),
 		},
 		announced.VersionToSchemeFunc{
 			extensionsv1beta1.SchemeGroupVersion.Version: extensionsv1beta1.AddToScheme,