Fix intraNodeUDPDstIPTraceflow Traceflow e2e test

The test was incorrect (traffic is dropped by an ingress policy
rule). However, this only became apparent after antrea-io#981 was merged and the
DMAC of the Traceflow packet started being set correctly.

test/e2e/traceflow_test.go

@@ -254,9 +254,9 @@ func TestTraceflow(t *testing.T) {
 							Action:        v1alpha1.Forwarded,
 						},
 						{
-							Component:     v1alpha1.Forwarding,
-							ComponentInfo: "Output",
-							Action:        v1alpha1.Delivered,
+							Component:     v1alpha1.NetworkPolicy,
+							ComponentInfo: "IngressDefaultRule",
+							Action:        v1alpha1.Dropped,
 						},
 					},
 				},