[root@controller ml2]# su -s /bin/sh -c "neutron-db-manage --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/ml2_conf.ini upgrade head" neutron
Traceback (most recent call last):
  File "/usr/bin/neutron-db-manage", line 10, in <module>
    sys.exit(main())
  File "/usr/lib/python2.7/site-packages/neutron/db/migration/cli.py", line 238, in main
    CONF.command.func(config, CONF.command.name)
  File "/usr/lib/python2.7/site-packages/neutron/db/migration/cli.py", line 105, in do_upgrade
    run_sanity_checks(config, revision)
  File "/usr/lib/python2.7/site-packages/neutron/db/migration/cli.py", line 229, in run_sanity_checks
    script_dir.run_env()
  File "/usr/lib/python2.7/site-packages/alembic/script.py", line 382, in run_env
    util.load_python_file(self.dir, 'env.py')
  File "/usr/lib/python2.7/site-packages/alembic/util.py", line 242, in load_python_file
    module = load_module_py(module_id, path)
  File "/usr/lib/python2.7/site-packages/alembic/compat.py", line 79, in load_module_py
    mod = imp.load_source(module_id, path, fp)
  File "/usr/lib/python2.7/site-packages/neutron/db/migration/alembic_migrations/env.py", line 23, in <module>
    from neutron.db.migration.models import head  # noqa
  File "/usr/lib/python2.7/site-packages/neutron/db/migration/models/head.py", line 48, in <module>
    from neutron.plugins.cisco.db.l3 import l3_models  # noqa
ImportError: No module named cisco.db.l3