network: install python-gobject package by default
network: install python-gobject package by default

The "nm" provider talks to NetworkManager via libnm and python GObject
introspection. Install the required python library by default.

Unfortunately, it's not immediately clear whether we want to install
python2-gobject or python3-gobject. Yeay, python.

linux-system-roles/network,linux-system-roles/network,linux-system-roles/network