[usb-moded] make sure all appsync services are not running on start. Fixes issues with services not working correctly before replug

Signed-off-by: Philippe De Swert <philippe.deswert@jollamobile.com>
[usb-moded] Remove the need to configure the interface in the config file, it can be fetched from connman too now

Signed-off-by: Philippe De Swert <philippe.deswert@jollamobile.com>