Bug 825192 - Reset fixed for WiFi and mobile usage.

Improved performance by using lazy evaluation of debug function.
Delayed initialization until ICCID is ensured.
Added hooks for NO SIM scenario (pending on bug 813009).
Fixed the problem of negative data usage. Related with a MindGap.getUsage bug.
Merge pull request #7423 from lodr/fix-reset-squashed

Bug 825192 - Reset fixed for WiFi and mobile usage.