[PROVISIONING prepare main to enable extending dbus api outside of main.c]

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
[PROVISIONING enable extending dbus api outside of main.c]

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>
[PROVISIONING implement org.freedesktop.DBus.Introspectable.Introspect]

Signed-off-by: Jarko Poutiainen <Jarko.Poutiainen@oss.tieto.com>