Comment 1 for bug 1693017

A barbican test @ master fails in a similar way:

Failed to import test module: unit_tests.test_barbican_handlers
Traceback (most recent call last):
  File "/home/rbeisner/git/charm-barbican/.tox/py35/lib/python3.5/site-packages/unittest2/loader.py", line 456, in _find_test_path
    module = self._get_module_from_name(name)
  File "/home/rbeisner/git/charm-barbican/.tox/py35/lib/python3.5/site-packages/unittest2/loader.py", line 395, in _get_module_from_name
    __import__(name)
  File "/home/rbeisner/git/charm-barbican/unit_tests/test_barbican_handlers.py", line 20, in <module>
    import reactive.barbican_handlers as handlers
  File "src/reactive/barbican_handlers.py", line 25, in <module>
    import charm.openstack.barbican as barbican # noqa
  File "src/lib/charm/openstack/barbican.py", line 114, in <module>
    class BarbicanCharm(charms_openstack.charm.HAOpenStackCharm):
  File "/home/rbeisner/git/charm-barbican/.tox/py35/lib/python3.5/site-packages/charms_openstack/charm.py", line 446, in __init__
    .format(release))
RuntimeError: Release mitaka is not a known OpenStack release