No more 'none' value.

Successfully writing the log file ue_080101.log and finding the sync marker.
Initialize OAI UE is working.
BuildOAIUE action seems ok. Must fix the log file path for the InitializeOAIUE action.
Doing the work in /tmp, not in the repository of the main.py script being executed.

Signed-off-by: Boris Djalal <boris.djalal@eurecom.fr>