android-provision MVNO/mbpi update

This pull request includes two changes:

1. Add support for IMSI and SPN MVNO types found in apns-conf.xml

2. Modify android-provision to additionally query mbpi and add any non-duplicate Apns found for a specific operator query.

This code has been tested on mako with image #250.

The easiest way to test is by using a modified apns-conf.xml file, and modifying android-apn.c to read from a writable directory.