Comment 21 for bug 1788403

http://logs.openstack.org/69/557169/20/gate/tempest-slow/b483789/controller/logs/screen-q-dhcp.txt.gz

It looks like a long time for dhcp response..
Sep 18 04:59:42.150904 ubuntu-xenial-ovh-gra1-0002079055 dnsmasq-dhcp[9696]: DHCPDISCOVER(tap69ea22e5-3e) fa:16:3e:02:83:aa
Sep 18 04:59:42.150929 ubuntu-xenial-ovh-gra1-0002079055 dnsmasq-dhcp[9696]: DHCPOFFER(tap69ea22e5-3e) 10.1.0.8 fa:16:3e:02:83:aa

2018-09-18 04:58:36,141 6822 DEBUG [tempest.scenario.manager] TestNetworkAdvancedServerOps:test_server_connectivity_cold_migration_revert begins to ping 172.24.5.2 in 120 sec and the expected result is reachable
2018-09-18 05:00:37,439 6822 DEBUG [tempest.lib.common.utils.test_utils] Call ping returns false in 120.000000 seconds