Comment 18 for bug 1696125

There is a weird 5 minute gap in the neutron L2 agent logs here:

http://logs.openstack.org/94/471494/2/check/gate-tempest-dsvm-neutron-linuxbridge-ubuntu-xenial/e0332b9/logs/screen-q-agt.txt.gz#_Jun_12_22_24_33_893133

Jun 12 22:19:32.086692 ubuntu-xenial-internap-mtl01-9270284 neutron-linuxbridge-agent[18735]: DEBUG oslo_concurrency.lockutils [None req-2b21118e-0da6-4c4a-a9d5-5d0e2cf4ccf8 None None] Lock "ebtables" released by "neutron.plugins.ml2.drivers.linuxbridge.agent.arp_protect.delete_arp_spoofing_protection" :: held 0.033s {{(pid=18735) inner /usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py:282}}
Jun 12 22:24:33.893133 ubuntu-xenial-internap-mtl01-9270284 neutron-linuxbridge-agent[18735]: DEBUG neutron.plugins.ml2.drivers.agent._common_agent [None req-2b21118e-0da6-4c4a-a9d5-5d0e2cf4ccf8 None None] Agent loop found changes! {'current': set(['tap3578cb80-7a', 'tap8b6dc92f-75', 'tapb7c1b8db-1e', 'tap999bcb19-81', 'tap839063fe-6d', 'tap3a6b0b5c-cb', 'tap14bcf3bb-af', 'tap0f5cf6b7-63']), 'timestamps': {'tap3578cb80-7a': 9, 'tap8b6dc92f-75': 6, 'tapb7c1b8db-1e': 10, 'tap999bcb19-81': 478, 'tap839063fe-6d': 484, 'tap3a6b0b5c-cb': 480, 'tap14bcf3bb-af': 479, 'tap0f5cf6b7-63': 11}, 'removed': set(['tape6c02d6c-e4']), 'added': set([]), 'updated': set([])} {{(pid=18735) daemon_loop /opt/stack/new/neutron/neutron/plugins/ml2/drivers/agent/_common_agent.py:452}}