service controller: store feature gate in local fields for better testability

Signed-off-by: Andrew Sy Kim <kim.andrewsy@gmail.com>

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

@@ -83,6 +83,7 @@ func startServiceController(ctx ControllerContext) (http.Handler, bool, error) {
 		ctx.InformerFactory.Core().V1().Services(),
 		ctx.InformerFactory.Core().V1().Nodes(),
 		ctx.ComponentConfig.KubeCloudShared.ClusterName,
+		utilfeature.DefaultFeatureGate,
 	)
 	if err != nil {
 		// This error shouldn't fail. It lives like this as a legacy.