Comment 3 for bug 1816552

I think there is something wrong on network ovn side
http://logs.openstack.org/60/634060/12/check/tripleo-ci-centos-7-standalone-os-tempest/2981018/logs/undercloud/var/log/extra/errors.txt.gz#_2019-02-19_08_13_14_027
2019-02-19 08:13:14.027 ERROR /var/log/extra/errors.txt: ERROR /var/log/containers/neutron/server.log: 30 ERROR ovsdbapp.event [-] Unexpected exception in notify_loop: KeyError: 'neutron:ovn-metadata-sb-cfg'
2019-02-19 08:13:14.027 ERROR /var/log/extra/errors.txt: ERROR /var/log/containers/neutron/server.log: 30 ERROR ovsdbapp.event Traceback (most recent call last):
2019-02-19 08:13:14.027 ERROR /var/log/extra/errors.txt: ERROR /var/log/containers/neutron/server.log: 30 ERROR ovsdbapp.event File "/usr/lib/python2.7/site-packages/ovsdbapp/event.py", line 137, in notify_loop
2019-02-19 08:13:14.027 ERROR /var/log/extra/errors.txt: ERROR /var/log/containers/neutron/server.log: 30 ERROR ovsdbapp.event match.run(event, row, updates)
2019-02-19 08:13:14.027 ERROR /var/log/extra/errors.txt: ERROR /var/log/containers/neutron/server.log: 30 ERROR ovsdbapp.event File "/usr/lib/python2.7/site-packages/networking_ovn/ovsdb/ovsdb_monitor.py", line 98, in run
2019-02-19 08:13:14.027 ERROR /var/log/extra/errors.txt: ERROR /var/log/containers/neutron/server.log: 30 ERROR ovsdbapp.event self._metadata_nb_cfg(row))
2019-02-19 08:13:14.027 ERROR /var/log/extra/errors.txt: ERROR /var/log/containers/neutron/server.log: 30 ERROR ovsdbapp.event File "/usr/lib/python2.7/site-packages/networking_ovn/ovsdb/ovsdb_monitor.py", line 86, in _metadata_nb_cfg
2019-02-19 08:13:14.027 ERROR /var/log/extra/errors.txt: ERROR /var/log/containers/neutron/server.log: 30 ERROR ovsdbapp.event return int(row.external_ids[ovn_const.OVN_AGENT_METADATA_SB_CFG_KEY])
2019-02-19 08:13:14.027 ERROR /var/log/extra/errors.txt: ERROR /var/log/containers/neutron/server.log: 30 ERROR ovsdbapp.event KeyError: 'neutron:ovn-metadata-sb-cfg'