To recreate just upgrade to the new python-oslo.messaging on all n-ovs units, restart neutron-openvswitch-agent, and instance creation will fail. The problem is the other neutron services on neutron-api and neutron-gateway are using the old olso.messaging code. Once neutron-api and neutron-gateway are upgraded and services restarted, instances can be created again.
To recreate just upgrade to the new python- oslo.messaging on all n-ovs units, restart neutron- openvswitch- agent, and instance creation will fail. The problem is the other neutron services on neutron-api and neutron-gateway are using the old olso.messaging code. Once neutron-api and neutron-gateway are upgraded and services restarted, instances can be created again.