dbusmonitor: remove listening to d-bus (u)mount signals
dbusmonitor: remove listening to d-bus (u)mount signals

It was never really intended to be here. The vrmlogger itself now listens for
(u)mount events.

The dbusmonitor.__init__ API is changed. A grep through all python files in
/opt/color-control shows no non-named arguments, so everything should still be
OK. Even it it causes a problem, it will be visible immediately: dbusmonitor
is typically instantiated on start-up.

victronenergy/velib_python