auth e2e: node_authn test: don't expect a SA secret

The test was expecting an SA token in a secret but pods are getting
their SA tokens via projected volumes by default. Also, the SA token
controller function is getting reduced so the original check is likely
to fail.

test/e2e/auth/node_authn.go

@@ -51,13 +51,6 @@ var _ = SIGDescribe("[Feature:NodeAuthenticator]", func() {
 
 		nodeIPs := e2enode.GetAddressesByTypeAndFamily(&nodes.Items[0], v1.NodeInternalIP, family)
 		framework.ExpectNotEqual(len(nodeIPs), 0)
-
-		// make sure ServiceAccount admission controller is enabled, so secret generation on SA creation works
-		saName := "default"
-		sa, err := f.ClientSet.CoreV1().ServiceAccounts(ns).Get(context.TODO(), saName, metav1.GetOptions{})
-		framework.ExpectNoError(err, "failed to retrieve service account (%s:%s)", ns, saName)
-		framework.ExpectNotEqual(len(sa.Secrets), 0)
-
 	})
 
 	ginkgo.It("The kubelet's main port 10250 should reject requests with no credentials", func() {