AndroidDevice: Fixed swipe_to_unlock
AndroidDevice: Fixed swipe_to_unlock

Previously swipe_to_unlock was not used and conflicted with a method
of the same name.

 - swipe_to_unlock() renamed perform_unlock_swipe()
 - swipe_to_unlock parameter now takes a direction, this allows swipe unlocking on Android M devices
 - ensure_screen_is_on() will now also unlock the screen if swipe_to_unlock is set

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