Comment 4 for bug 1519410

With commit: 7d42ee769cdd4f4dc7b2ca1d85557bc471ce4b7e for neutron (target is Mitaka), it looks the error message isn't be outputted. (but the warning message is still outputted.)
For kilo version, how about setting "dhcp_agent_notification=false" in neutron.conf? I suppose MidoNet doesn't need notifications for dhcp agent and this setting makes no functional impacts.