Code review comment for lp://staging/~barry/ubuntu-system-image/lp1383539

Sorry, forgot to run the testsuite; I installed python-tox, python3-nose and python3-psutil and get this when running tox:
py34 develop-inst-nodeps: /home/lool/bzr/launchpad/~barry/ubuntu-system-image/lp1383539
py34 runtests: PYTHONHASHSEED='612702447'
py34 runtests: commands[0] | python -m nose2 -v
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/dbus/bus.py", line 175, in activate_name_owner
    return self.get_name_owner(bus_name)
  File "/usr/lib/python3/dist-packages/dbus/bus.py", line 361, in get_name_owner
    's', (bus_name,), **keywords)
  File "/usr/lib/python3/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NameHasNoOwner: Could not get owner of name 'com.canonical.applications.Downloader': no such name

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.4/runpy.py", line 170, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.4/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/usr/lib/python3/dist-packages/nose2/__main__.py", line 12, in <module>
    discover()
  File "/usr/lib/python3/dist-packages/nose2/main.py", line 284, in discover
    return main(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/nose2/main.py", line 98, in __init__
    super(PluggableTestProgram, self).__init__(**kw)
  File "/usr/lib/python3.4/unittest/main.py", line 93, in __init__
    self.runTests()
  File "/usr/lib/python3/dist-packages/nose2/main.py", line 260, in runTests
    self.result = runner.run(self.test)
  File "/usr/lib/python3/dist-packages/nose2/runner.py", line 45, in run
    self.session.hooks.startTestRun(event)
  File "/usr/lib/python3/dist-packages/nose2/events.py", line 224, in __call__
    result = getattr(plugin, self.method)(event)
  File "/home/lool/bzr/launchpad/~barry/ubuntu-system-image/lp1383539/systemimage/testing/helpers.py", line 240, in wrapper
    return function(*args, **kws)
  File "/home/lool/bzr/launchpad/~barry/ubuntu-system-image/lp1383539/systemimage/testing/nose.py", line 112, in startTestRun
    SystemImagePlugin.controller.start()
  File "/home/lool/bzr/launchpad/~barry/ubuntu-system-image/lp1383539/systemimage/testing/controller.py", line 242, in start
    self._start()
  File "/home/lool/bzr/launchpad/~barry/ubuntu-system-image/lp1383539/systemimage/testing/controller.py", line 234, in _start
    starter(self)
  File "/home/lool/bzr/launchpad/~barry/ubuntu-system-image/lp1383539/systemimage/testing/controller.py", line 82, in start_downloader
    service = bus.get_object('com.canonical.applications.Downloader', '/')
  File "/usr/lib/python3/dist-packages/dbus/bus.py", line 241, in get_object
    follow_name_owner_changes=follow_name_owner_changes)
  File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 248, in __init__
    self._named_service = conn.activate_name_owner(bus_name)
  File "/usr/lib/python3/dist-packages/dbus/bus.py", line 180, in activate_name_owner
    self.start_service_by_name(bus_name)
  File "/usr/lib/python3/dist-packages/dbus/bus.py", line 278, in start_service_by_name
    'su', (bus_name, flags)))
  File "/usr/lib/python3/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ExecFailed: Failed to execute program com.canonical.applications.Downloader: Success
ERROR: InvocationError: '/home/lool/bzr/launchpad/~barry/ubuntu-system-image/lp1383539/.tox/py34/bin/python -m nose2 -v'
___________________________________ summary ____________________________________
ERROR: py34: commands failed