Merge pull request #35 from alfonsosanchezbeato/devinfo-refactoring

Devinfo refactoring
unit: Add tests for gprs/netreg re-factoring

Also cleaned up formatting of parcel hex data
which inadvertently included tabs as whitespace
between bytes instead of spaces for some messages.
Merge pull request #34 from tonyespy/gprs-netreg-unit-tests

Gprs netreg unit tests
rilmodem: Support for USSD and SS provisioning
gril: Parcel processing for USSD and SS
build: Build ussd and call-settings for rilmodem
plugins: Create ussd and call-settings for ril