Simple connection

In order to simplify the whole sequence to get the modem connected, ModemManager still exposes a Simple interface, renamed as: org.freedesktop.ModemManager1.Modem.Simple .

The Connect() method will create a single bearer with the parameters specified in the call an get it connected, while the Disconnect() method will disconnect all available bearers.

One of the main differences with respect to the 0.6 interface, is that Connect() doesn't support to change allowed modes or bands. Instead, these operations should be done through the methods in the org.freedesktop.ModemManager1.Modem interface.