kubelet e2e: Enable the disruptive test

The test was disabled because the runc issue rendered the nodes
unusable,now that it is fixed in flatcar stable it makes sense to enable
it.

Signed-off-by: Suraj Deshmukh <suraj@kinvolk.io>

test/components/kubernetes/kubelet_disruptive_test.go

@@ -30,10 +30,6 @@ import (
 )
 
 func TestSelfHostedKubeletLabels(t *testing.T) {
-	t.Skip("This test will always fail, as Flatcar currently ships version of runc, which has a race " +
-		"condition bug, which makes self-hosted kubelet to hang when the pod is removed. " +
-		"It should be re-enabled once the fix reaches Flatcar stable channel.")
-
 	client := testutil.CreateKubeClient(t)
 
 	// List all the nodes and then delete a node that is not controller.