I confirm the issue I reported in comment #7 has been fixed. After installing openvswitch-common, openvswitch-switch, python-openvswitch 2.9.2-0ubuntu0.18.04.2 the neutron-openvswitch-agent continued working and after restarting neutron-openvswitch-agent network traffic between running instances was working again. Restarting the neutron nodes also worked, neutron-ovs-cleanup.log did not complain about the missing compat module anymore. (leaving formal verification to the openstack team, as mentioned in the bug description)
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