Werk #13420: Fix section parsing with different separators

In checkmk it's possible to transport a single section with different separators:

<<<section:sep(44)>>> a,1 <<<section:sep(124)>>> b|2 <<<section:sep(44)>>> c,3

Up until this werk, the ordering of the lines where not preserved, the check function would have received them as a,1 c,3 b,2

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