We don't need this in a Python 3-only world.
Remove six in follows:mport six
1. zaqar/storage/utils.py
2. zaqar/tests/functional/base.py
3. zaqar/tests/functional/http.py
4. zaqar/tests/functional/wsgi/v1/test_queues.py
5. zaqar/tests/functional/wsgi/v1_1/test_queues.py
6. zaqar/tests/helpers.py
Change-Id: I5bb806fd544bd10c7c6e561ef0eeffd6986897f0