test: Simplify DNS proxy port / TFTP source port conflict test.

Since we address NodePort in k8s2 using the DNS proxy port of k8s2 as
the source port from k8s1, one round is enough regardless of the
backend selection, as in both cases the replies are reverse NATted at
k8s2 (where the port conflict was happening before it was fixed by
#12248).

Fixes: #12336
Signed-off-by: Jarno Rajahalme <jarno@covalent.io>

test/k8sT/Services.go

@@ -1219,9 +1219,10 @@ var _ = Describe("K8sServicesTest", func() {
 				err := kubectl.Get(helpers.DefaultNamespace, "service test-nodeport").Unmarshal(&data)
 				Expect(err).Should(BeNil(), "Can not retrieve service")
 
-				// Test enough times to get random backend selection from both nodes.
-				// The interesting case is when the backend is at k8s2.
-				count := 10
+				// Since we address NodePort in k8s2 using the DNS proxy port of k8s2 as
+				// the source port from k8s1, one round is enough regardless of the backend
+				// selection, as in both cases the replies are reverse NATted at k8s2.
+				count := 1
 				fails := 0
 				// Client from k8s1
 				clientPod, _ := kubectl.GetPodOnNodeLabeledWithOffset(helpers.K8s1, testDSClient, 0)