To be consistent with other services only start via hotplug if enabled.
Now full functionality of /etc/init.d/ddns enable/disable start/stop
Optimization: Include script only if needed
Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>
Hotplug script will start service for each interface.
To prevent duplicates and in general must not start on boot.
Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>