Werk #5649: Fixed performance issue caused by too many parse function calls

Fixed a regression that was introduced with 1.5.0i2. The parse functions were called not only once per Check_MK check, as it is intended. Each service of a Check_MK check lead to a new call of the parse function logic.

For example in case you have 100 services of a single check type on one host, the parse logic was called a hundred times instead of a single time.

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