[Merge] lp:~brendan-donegan/camera-app/location_prompt_disable into lp:camera-app

[Brendan Donegan]

Brendan Donegan has proposed merging lp:~brendan-donegan/camera-app/location_prompt_disable into lp:camera-app.

Commit message:
Finally remove location prompts during testing

Requested reviews:
  Canonical Platform QA Team (canonical-platform-qa)
  Ubuntu Phablet Team (phablet-team)

For more details, see:
https://code.launchpad.net/~brendan-donegan/camera-app/location_prompt_disable/+merge/230961

This branch removes the prompts for location that appear when camera-app is run normally, which interfere with autopilot testing. A previous attempt was made at this but wasn't done correctly. This has been tested thoroughly and definitely works - promise :)

It sets a property called 'custom.location.testing' which is recognized by the ubuntu-location-service upstart job and sets the correct environment variable to start the location service in testing mode (which does not prompt the user).

Please do give this an independent check before merging as we don't want to have to do this fix again.
-- 
https://code.launchpad.net/~brendan-donegan/camera-app/location_prompt_disable/+merge/230961
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~brendan-donegan/camera-app/location_prompt_disable into lp:camera-app.