Comment 93 for bug 1789177

tested pkg in bionic

steps are below ( the same as queens above )

1. deploy bionic env
2. upgrade python-oslo.messaging in nova-compute/0
3. restart neutron-openvswitch-agent ( only )
4. check logs , no error
5. launch instance if it works, no error

ii python-oslo.messaging 5.35.0-0ubuntu4 all oslo messaging library - Python 2.x