Fix the network policy tests.

This is a cherrypick of the following commit https://github.com/kubernetes/kubernetes/pull/74290/commits

Fix the network policy tests.
249d74f3 · Zang Li · 6c1e64b9 · 249d74f3
Commit 249d74f3 authored Mar 08, 2019 by Zang Li
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network_policy.go test/e2e/network/network_policy.go +1 -1

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--- a/test/e2e/network/network_policy.go
+++ b/test/e2e/network/network_policy.go
@@ -560,7 +560,7 @@ func createNetworkClientPod(f *framework.Framework, namespace *v1.Namespace, pod
 					Args: []string{
 						"/bin/sh",
 						"-c",
-						fmt.Sprintf("for i in $(seq 1 5); do curl -s -m 8 %s.%s:%d && exit 0 || sleep 1; done; exit 1",
+						fmt.Sprintf("for i in $(seq 1 5); do nc -vz -w 8 %s.%s %d && exit 0 || sleep 1; done; exit 1",
 							targetService.Name, targetService.Namespace, targetPort),
 					},
 				},