Comment 2 for bug 1599458

After I skipped the ARP Response Test, the next test case still failed without any corresponding logs.

2016-07-24 03:40:24.271 | Test id Runtime (s)
2016-07-24 03:40:24.273 | -------------------------------------------------------------------------- -----------
2016-07-24 03:40:24.274 | dragonflow.tests.fullstack.test_apps.TestDHCPApp.test_dhcp_app 64.159
2016-07-24 03:40:24.276 | dragonflow.tests.fullstack.test_apps.TestApps.test_infrastructure 7.714
2016-07-24 03:40:24.277 | dragonflow.tests.fullstack.test_apps.TestArpResponder.test_simple_response 0.000