test: Make print calls compatible with Python 3

Turn print calls into print() function calls and avoid using comma-separated
arguments, so that they work and look the same with both Python 2 and 3.
test: Make exception catching compatible with Python 3

Use "except Type as var" syntax to work with both Python >= 2.6 and Python 3.
test: Replace obsolete has_key() with "in" to also work with Python 3
test: Move from static gobject bindings to GI

Use GLib gobject-introspection bindings so that we can also use the scripts
with Python 3.
test: Fix inconsistent tab/space usage

This is disallowed in Python 3.
test rilmodem: Ensure property keys is a list

In Python 3 it is an iterator, so always convert it to a list. This change is
compatible with Python 2.
test: Convert to Python 3

Change raw_input() to input() and unicode to str. This is *not* compatible with
Python 2.
test: Switch scripts to run with Python 3

Update the hashbangs.
Merge pull request #56 from martinpitt/master

Port ofono test scripts to Python3
test/rilmodem: add copyright/license headers
Merge pull request #57 from tonyespy/test-rilmodem-copyright

test/rilmodem: add copyright/license headers
test: add exception handling to some scripts

Add exception handling to 'enable-modem' and 'list-modems',
so that they don't crash when ofono isn't running and/or
hasn't completely initialized.
rilmodem: add call-forwarding atom

Add call-forwarding atom from nemobile github repository:

https://github.com/nemomobile-packages/ofono/tree/master/ofono

The original authors of this code are:

Jussi Kangas <jussi.kangas@tieto.com>
Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
gril: add call-forwarding support

Add parcel building/parsing functions for call-forwarding support.
rilmodem: clean/re-factor call-forward atom

Clean up the call-forward atom by reducing code
duplication, and re-factoring to use new grilreply/
grilrequest parcel functions.
build: enable rilmodem call-forwarding atom
plugins/ril: enable call-forwarding support
Merge pull request #58 from tonyespy/test-script-exceptions

Tested on mako
test: add argument parsing to test-call-forwarding
Merge pull request #55 from tonyespy/call-forwarding

Call forwarding