Werk #12462: Fixed excessively long compuation time of timeperiods during core config generation

Component	Core & setup
Title	Fixed excessively long compuation time of timeperiods during core config generation
Date	Apr 21, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Pro, Checkmk Ultimate MT 2.0.0p4 Checkmk Pro, Checkmk Ultimate MT

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