Provide __str__ for dbus ints, needed for python3.8
Python 3.8 removed __str__ implementations from builtin types bool, int,
float, complex and few classes from the standard library. They now
inherit __str__() from object. As result, defining the __repr__() method
in the subclass of these classes will affect their string
representation.
Thus with python 3.8, python3 -c 'import dbus; print(str(dbus.Int32(34)))' gives
dbus.Int32(34) instead of 34.
We now provide a __str__ method to dbus ints and longs to revert to the
previous behaviour.
Closes #31 (closed)
Edited by Mathieu Clabaut