Fixes the cyclical dependency between celery.py and tasks.py when update_all_tle is called outside of celery by switching to autodiscovered tasks
Signed-off-by: Corey Shields <cshields@gmail.com>
[acinonyx@openwrt.gr: use @shared_task decorator and wrapper tasks to workaround celery bug]
Signed-off-by: Vasilis Tsiligiannis <acinonyx@openwrt.gr>