Merge lp://qastaging/~mterry/ubuntu-system-settings/wizard-introspection-rtm into lp://qastaging/ubuntu-system-settings/rtm-14.09

Allow autopilot introspection of the wizard.

Allow autopilot introspection of the wizard.

To test this, you can restart the wizard with introspection:

stop ubuntu-system-settings-wizard WIZARD_DONT_RESUME_UNITY=1
start ubuntu-system-settings-wizard QT_LOAD_TESTABILITY=1

And run a simple script like so to verify introspection works:

$ cat test.py
from autopilot.introspection import get_proxy_object_for_existing_process
import sys
print get_proxy_object_for_existing_process(pid=int(sys.argv[1]))
$ python test.py `pidof system-settings-wizard`

== Checklist ==

 * Is your branch in sync with latest trunk (e.g. bzr pull lp:trunk -> no changes)
 Yes

 * Did you build your software in a clean sbuild/pbuilder chroot or ppa?
 Yes

 * Did you build your software in a clean sbuild/pbuilder armhf chroot or ppa?
 Yes

 * Has your component "TestPlan” been executed successfully on emulator, N4?
 Yes

 * Has a 5 minute exploratory testing run been executed on N4?
 Yes

 * If you changed the packaging (debian), did you subscribe a core-dev to this MP?
 NA

 * If you changed the UI, did you subscribe the design-reviewers to this MP?
 NA

 * What components might get impacted by your changes?
 Just wizard

 * Have you requested review by the teams of these owning components?
 Yes