keystone-manage db_sync
Traceback (most recent call last):
  File "/usr/local/bin/keystone-manage", line 4, in <module>
    from pkg_resources import require; require('keystone==2013.2.a104.g3ed9c32')
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2711, in <module>
    parse_requirements(__requires__), Environment()
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 584, in resolve
    raise DistributionNotFound(req)
pkg_resources.DistributionNotFound: SQLAlchemy>=0.7.8,<=0.7.9