Bearer connection stats, updated to use rx-bytes and tx-bytes

[Dan Williams]

On Wed, 2015-12-02 at 17:32 +0100, Aleksander Morgado wrote:
> This v2 series has the following updates:
> 
>  * Renamed the key names in the Stats dictionary to 'rx-bytes' and
> 'tx-bytes'.
>  * Use G_SOURCE_CONTINUE update instead of TRUE as return for
> GSourceFunc (all the other GSourceFunc returns have already been
> changed in git master).
>  * Fixed error reporting in the QMI bearer implementation, it wasn't
> properly finishing the context as soon as the error was found.
>  * Stats reloading implemented in the MBIM bearer.

LGTM now; want me to test or are you OK with it so far?

Dan