Return value for model.get_action_output() has changed

[johnsca]

test_run_action is failing with:

Traceback (most recent call last):
  File "/home/johnsca/juju/libs/python-libjuju/tests/integration/test_unit.py", line 60, in test_run_action
    assert action.results == {'dir': '/var/git/myrepo.git'}
AssertionError: assert {'Code': '0',...t/myrepo.git'} == {'dir': '/var/git/myrepo.git'}
  Omitting 1 identical items, use -vv to show
  Left contains 2 more items:
  {'Code': '0',
   'Stdout': "Adding group `myrepo' (GID 1001) ...\n"
             'Done.\n'
             'Initialized empty Git repository in /var/git/myrepo.git/\n'}