Werk #13843: Active discovery check: use cached data

The active discovery check Check_MK Discovery did not use cached data. This could lead to lost logwatch messages.

Upon retriggering the Check_MK Discovery service, we now firstly trigger the Check_MK service (thereby updating the caches) and then run the Check_MK Discovery service on the cached data. That way, we get the live information without loosing log messages.

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