[PATCH] Read EF-PNN, EF-OPL and override network names accordingly.

[Denis Kenzior]

Hi,

Patch has been applied.  However, I've completely (juding by 40 or so commits) 
refactored how SIM filesystem is handled in oFono so I might have introduced 
some bugs.  Could you test to make sure it is working as intended?

Can you submit some unit tests with sample PNN/OPL data?

Regards,
-Denis