[TOX] can't pass tox on clean build

Hello,

Trying to run tox (tox -epy27) from the root of a brand new cloned Quantum build, I obtain a bunch of errors ALL like the following:

ImportError: Failed to import test module: quantum.tests.unit.testlib_api
Traceback (most recent call last):
  File "/usr/lib/python2.7/unittest/loader.py", line 252, in _find_tests
    module = self._get_module_from_name(name)
  File "/usr/lib/python2.7/unittest/loader.py", line 230, in _get_module_from_name
    __import__(name)
  File "/opt/stack/quantum/quantum/tests/unit/testlib_api.py", line 20, in <module>
    from quantum import wsgi
  File "/opt/stack/quantum/quantum/wsgi.py", line 39, in <module>
    from quantum import context
  File "/opt/stack/quantum/quantum/context.py", line 24, in <module>
    from quantum.db import api as db_api
  File "/opt/stack/quantum/quantum/db/api.py", line 23, in <module>
    from quantum.openstack.common.db.sqlalchemy import session
  File "/opt/stack/quantum/quantum/openstack/common/db/sqlalchemy/session.py", line 283, in <module>
    deprecated_opts=[cfg.DeprecatedOpt('sql_connection',
AttributeError: 'module' object has no attribute 'DeprecatedOpt'

And then it ends this way:

----------------------------------------------------------------------
Binary content:
  traceback (test/plain; charset="utf8")
Ran 501 tests in 2.623s (-0.267s)
FAILED (id=8, failures=127)
error: testr failed (1)
ERROR: InvocationError: '/opt/stack/quantum/.tox/py27/bin/python setup.py testr --slowest --testr-args='
______________________________________________________________________ summary _______________________________________________________________________
ERROR: py27: commands failed

Am I missing something? :)