buildroot

package/python-networkmanager: Bump to version 2.0.1

Added new runtime dependency on python-six.

Dropped dbus-python as build time dependency (it's only runtime
dependency).

Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>