Comment 10 for bug 1788403

The related monitor events:
Sep 18 04:58:26.258153 ubuntu-xenial-ovh-gra1-0002079055 neutron-openvswitch-agent[23053]: DEBUG neutron.agent.common.async_process [-] Output received from [ovsdb-client monitor tcp:127.0.0.1:6640 Interface name,ofport,external_ids --format=json]: {"data":[["15170696-5e84-42e4-9aa0-5edfdeb28b70","insert","tapdcabb610-ec",["set",[]],["map",[["attached-mac","fa:16:3e:02:83:aa"],["iface-id","dcabb610-ecaa-43c4-8c3d-e7f056024c3a"],["iface-status","active"],["vm-id","d91b159b-2457-49a1-b922-507f3cf78c7c"]]]]],"headings":["row","action","name","ofport","external_ids"]} {{(pid=23053) _read_stdout /opt/stack/neutron/neutron/agent/common/async_process.py:242}}
Sep 18 04:58:26.260293 ubuntu-xenial-ovh-gra1-0002079055 neutron-openvswitch-agent[23053]: DEBUG neutron.agent.common.async_process [-] Output received from [ovsdb-client monitor tcp:127.0.0.1:6640 Interface name,ofport,external_ids --format=json]: {"data":[["15170696-5e84-42e4-9aa0-5edfdeb28b70","old",null,["set",[]],null],["","new","tapdcabb610-ec",26,["map",[["attached-mac","fa:16:3e:02:83:aa"],["iface-id","dcabb610-ecaa-43c4-8c3d-e7f056024c3a"],["iface-status","active"],["vm-id","d91b159b-2457-49a1-b922-507f3cf78c7c"]]]]],"headings":["row","action","name","ofport","external_ids"]} {{(pid=23053) _read_stdout /opt/stack/neutron/neutron/agent/common/async_process.py:242}}
Sep 18 04:58:29.464005 ubuntu-xenial-ovh-gra1-0002079055 neutron-openvswitch-agent[23053]: DEBUG neutron.agent.common.async_process [-] Output received from [ovsdb-client monitor tcp:127.0.0.1:6640 Interface name,ofport,external_ids --format=json]: {"data":[["15170696-5e84-42e4-9aa0-5edfdeb28b70","old",null,26,null],["","new","tapdcabb610-ec",-1,["map",[["attached-mac","fa:16:3e:02:83:aa"],["iface-id","dcabb610-ecaa-43c4-8c3d-e7f056024c3a"],["iface-status","active"],["vm-id","d91b159b-2457-49a1-b922-507f3cf78c7c"]]]]],"headings":["row","action","name","ofport","external_ids"]} {{(pid=23053) _read_stdout /opt/stack/neutron/neutron/agent/common/async_process.py:242}}
Sep 18 04:58:29.663664 ubuntu-xenial-ovh-gra1-0002079055 neutron-openvswitch-agent[23053]: DEBUG neutron.agent.common.async_process [-] Output received from [ovsdb-client monitor tcp:127.0.0.1:6640 Interface name,ofport,external_ids --format=json]: {"data":[["15170696-5e84-42e4-9aa0-5edfdeb28b70","delete","tapdcabb610-ec",-1,["map",[["attached-mac","fa:16:3e:02:83:aa"],["iface-id","dcabb610-ecaa-43c4-8c3d-e7f056024c3a"],["iface-status","active"],["vm-id","d91b159b-2457-49a1-b922-507f3cf78c7c"]]]]],"headings":["row","action","name","ofport","external_ids"]} {{(pid=23053) _read_stdout /opt/stack/neutron/neutron/agent/common/async_process.py:242}}