include: Add gid1 to provisioning interface

The content of file EF_GID1 is a new argument for the get_settings
function of the provisioning interface.
plugins: Add GID1 content to provisioning plugins
src: Use EF_GID1 content for provisioning APNs
examples: Add EF_GID1 data to provisioning plugin
Merge pull request #72 from alfonsosanchezbeato/mvno-gid

Support for gid type MVNOs in Android APN database