Code review comment for lp:~doanac/phablet-tools/unlock_screen

I have a branch that calls the unity8 provided helpers to make sure the screen is unlocked. Also I had a chat with thomi and he believes that the unlocking logic should not be used inside each App' test suite and external tools like phablet-test-run should take care of that.

https://code.launchpad.net/~om26er/phablet-tools/unlock_screen/+merge/195529