Gate on Python 3.3
Gate on Python 3.3

This makes OS-jenkins run our tests in Python 3.3 mode in addition to
Python 2.6 and Python 2.7.

Rationale: keep our Python 3 compatibility high

Change-Id: Ia4c2964f7cc2a8e5ec0b47818698a96ec93fc892

rackerlabs/marconi,openstack/zaqar,openstack/zaqar,openstack/zaqar,openstack/zaqar