Update device plugin e2e_node test to not changing Kubelet config

as DevicePlugins feature is enabled by default now.

test/e2e_node/device_plugin.go

@@ -29,8 +29,6 @@ import (
 	"k8s.io/apimachinery/pkg/util/uuid"
 
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-	"k8s.io/kubernetes/pkg/features"
-	"k8s.io/kubernetes/pkg/kubelet/apis/kubeletconfig"
 	"k8s.io/kubernetes/test/e2e/framework"
 
 	pluginapi "k8s.io/kubernetes/pkg/kubelet/apis/deviceplugin/v1beta1"
@@ -46,20 +44,11 @@ const (
 )
 
 // Serial because the test restarts Kubelet
-var _ = framework.KubeDescribe("Device Plugin [Feature:DevicePlugin] [Serial] [Disruptive]", func() {
+var _ = framework.KubeDescribe("Device Plugin [Feature:DevicePlugin]", func() {
 	f := framework.NewDefaultFramework("device-plugin-errors")
 
 	Context("DevicePlugin", func() {
-		By("Enabling support for Device Plugin")
-		tempSetCurrentKubeletConfig(f, func(initialConfig *kubeletconfig.KubeletConfiguration) {
-			initialConfig.FeatureGates[string(features.DevicePlugins)] = true
-		})
-
 		It("Verifies the Kubelet device plugin functionality.", func() {
-
-			By("Wait for node is ready")
-			framework.WaitForAllNodesSchedulable(f.ClientSet, framework.TestContext.NodeSchedulableTimeout)
-
 			By("Start stub device plugin")
 			// fake devices for e2e test
 			devs := []*pluginapi.Device{