[PATCH] Cache EF-PNN, EF-OPL sim files on disk.

[Denis Kenzior]

> This uses plain files in /var/cache/ofono for storing contents of the
> operator lists to avoid possibly numerous queries to the SIM on every
> startup.  Files are indexed with IMSI.  I'm not 100% sure about the
> autoconf magic.
>
> Users need to rerun bootstrap-configure after applying this.

Can you rebase and resubmit this patch?  The changes to sim.c and network.c 
were a bit extensive.

Thanks,
-Denis