Comment 3 for bug 1198040

devstack has the same problem due to the rename of quantumclient:

$ /usr/bin/nova-api
Traceback (most recent call last):
  File "/usr/bin/nova-api", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2735, in <module>
    working_set.require(__requires__)
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 690, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 588, in resolve
    raise DistributionNotFound(req)
pkg_resources.DistributionNotFound: python-quantumclient>=2.2.0,<3.0.0