I'm not that familiar with upgrades but looking at your output (INFO [alembic.migration] Running upgrade None -> havana, havana_initial ) and mail question from yesterday about upgrade I think you should first stamp your DB as Icehouse : neutron-db-manage --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/ml2_conf.ini stamp icehouse and then run upgrade.
Jacek
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