Bug 933133 - [Gaia][Messages] Handling proactive notification while message report return

- Add system message 'sms-delivery-success' and 'sms-read-success' for showing the notification when report return success.
- Refine the sms received part into smaller part for better using in delivery/read success notification
ok, you do, sorry ;)

you'll need a comment to this function, to explain clearly that you return the function to release the lock