[nettime] Initial checkin of Network time plugin.

This commit was sourced from the following commit:

http://gitweb.merproject.org/gitweb?p=mer-core/ofono.git;a=commit;h=57f276b092ac398bdee0d2fbee48184f66130fb3
[nettime] Added test scripts.
[ril/rilmodem] Add real calls for revision and IMEI probe
rilmodem/devinfo.c: using RIL_REQUEST_GET_IMEI for imei (works for both maguro and mako)
rilmodem/devinfo.c: only free revision/imei if it's valid
[gril] Exit on RILD socket errors.
rilmodem/devinfo.c: fixes from code review
[rilmodem] Add SIM PIN/PUK support.

This is based on code from Jolla which has been re-factored:

https://github.com/nemomobile-packages/ofono/tree/master/ofono
[ril] Add SIM PIN/PUK support.

This is based on code from Jolla which has been re-factored:

https://github.com/nemomobile-packages/ofono/tree/master/ofono
[rilmodem] Minor re-factoring of PIN code.
[rilmodem] Fix compile error.
[ril] Fix compile error.
[rildmodem] Fix SIM logic to make copies of aid/app strings.
[rilmodem] Re-factor SIM aid/app string code to use g_strdup().