launch_upstart_application fails under systemd-based systems

[Cris Dywan]

Apparently ever since I switched to systemd on my laptop the tests based launch_upstart_application on always fail:

> ./run_tests.sh ubuntuuitoolkit.tests.custom_proxy_objects.test_main_view.MainView10TestCase.test_get_tabs_without_tabs -v
15:37:32.012 INFO run:235 - Autopilot Source Version: 1.5.0
Autopilot Package Version: 1.5.0+15.04.20150226.1-0ubuntu1
Loading tests from: /home/rumo/bau/uut.staging/tests/autopilot

15:37:32.069 INFO _logging:40 - ************************************************************
15:37:32.069 INFO _logging:41 - Starting test ubuntuuitoolkit.tests.custom_proxy_objects.test_main_view.MainView10TestCase.test_get_tabs_without_tabs
15:37:32.069 ERROR content:47 - Could not add content object 'None' due to IO Error: [Errno 13] Permission denied: '/var/log/syslog'
15:37:32.070 DEBUG _video:79 - Starting: ['/usr/bin/recordmydesktop', '--no-sound', '--no-frame', '-o', '../../ubuntuuitoolkit.tests.custom_proxy_objects.test_main_view.MainView10TestCase.test_get_tabs_without_tabs.ogv']

(autopilot3:14049): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:2:19: Theming engine 'adwaita' not found
15:37:33.391 WARNING base:52 - This function is deprecated. Use get_toolkit_launcher_command() instead.
15:37:33.444 INFO logging:45 - str: Set the value of an initctl environment variable. Arguments ('tmpylwselxw',). Keyword arguments: {'global_': True}.
15:37:33.459 INFO logging:45 - str: Set the value of an initctl environment variable. Arguments ('/home/rumo/bau/uut.staging/modules',). Keyword arguments: {'global_': True}.
15:37:33.472 INFO logging:45 - str: Set the value of an initctl environment variable. Arguments ('/home/rumo/bau/uut.staging/modules',). Keyword arguments: {'global_': True}.
15:37:33.485 INFO logging:45 - str: Set the value of an initctl environment variable. Arguments ('/home/rumo/bau/uut.staging/modules',). Keyword arguments: {'global_': True}.
15:37:33.492 INFO _launcher:120 - Attempting to launch application 'tmpylwselxw' with URIs 'lalala' via upstart-app-launch
15:37:35.549 INFO logging:45 - str: Set the value of an initctl environment variable. Arguments ('/home/rumo/bau/uut.staging/modules',). Keyword arguments: {'global_': True}.
15:37:35.553 INFO logging:45 - str: Set the value of an initctl environment variable. Arguments ('/home/rumo/bau/uut.staging/modules',). Keyword arguments: {'global_': True}.
15:37:35.562 INFO logging:45 - str: Set the value of an initctl environment variable. Arguments ('/home/rumo/bau/uut.staging/modules',). Keyword arguments: {'global_': True}.
15:37:35.568 INFO logging:45 - str: Remove an initctl environment variable. Arguments (). Keyword arguments: {'global_': True}.
15:37:43.556 ERROR testresult:44 - ERROR: ubuntuuitoolkit.tests.custom_proxy_objects.test_main_view.MainView10TestCase.test_get_tabs_without_tabs
15:37:43.556 ERROR testresult:44 - traceback: {{{
Traceback (most recent call last):
  File "/home/rumo/bau/uut.staging/tests/autopilot/ubuntuuitoolkit/tests/__init__.py", line 132, in setUp
    super(QMLStringAppTestCase, self).setUp()
  File "/home/rumo/bau/uut.staging/tests/autopilot/ubuntuuitoolkit/tests/__init__.py", line 96, in setUp
    self.launch_application()
  File "/home/rumo/bau/uut.staging/tests/autopilot/ubuntuuitoolkit/tests/__init__.py", line 113, in launch_application
    emulator_base=ubuntuuitoolkit.UbuntuUIToolkitCustomProxyObjectBase)
  File "/usr/lib/python3/dist-packages/autopilot/testcase.py", line 348, in launch_upstart_application
    return launcher.launch(application_name, uris)
  File "/usr/lib/python3/dist-packages/autopilot/application/_launcher.py", line 140, in launch
    state.get('message', '')
  File "/usr/lib/python3/dist-packages/autopilot/application/_launcher.py", line 233, in _check_status_error
    raise RuntimeError(': '.join(message_parts))
RuntimeError: Application Launch Failed: Application failed to start.
}}}
15:37:43.556 ERROR testresult:44 - Binary attachment: "FailedTestScreenshot" (image/png)