unit tests fail because site packages are used

[Mark McLoughlin]

On my machine at least, if I check out oslo-incubator and do:

  $> tox

I get:

 WARNING:test command found but not installed in testenv
 ..

 ERROR: Failure: ImportError (No module named mock)
----------------------------------------------------------------------
 Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/nose/loader.py", line 390, in loadTestsFromName
    addr.filename, addr.module)
  File "/usr/lib/python2.7/site-packages/nose/importer.py", line 39, in importFromPath
    return self.importFromDir(dir_path, fqname)
  File "/usr/lib/python2.7/site-packages/nose/importer.py", line 86, in importFromDir
    mod = load_module(part_fqname, fh, filename, desc)
  File "/home/markmc/git/openstack/oslo-incubator/tests/unit/middleware/test_context.py", line 20, in <module>
    import mock
 ImportError: No module named mock

this fixes it:

  $> bash -c '. .tox/py27/bin/activate && pip install --upgrade nose'

I suspect tox being configured with sitepackages=True is the issue

[Mark McLoughlin (markmc)]

https://review.openstack.org/16752