One can use add_timer or schedule_timer to add a timer. After
the timeout time has been reached the callback will be called.
One can call add_time/schedule_timer and del_timer from within
* initialize OML and RSL based on TEI establish (ACTIVATE_IND) events
* fix abis_nm_raw_msg() to not overwrite the OML header with payload
* fix debug print statements
* fix msgb_dequeue: actually dequeue it from the list ;)