[PATCH] [rilmodem][WIP] Add IMEI and revision query support

This is based on code from Canonical
https://code.launchpad.net/~phablet-team/phablet-extras/ofono


Signed-off-by: Petri Takalokastari <petri.takalokastari@oss.tieto.com>
Merge pull request #24 from ptakalok/master

Add IMEI and revision query support