Werk #2194: Avoid new discovered checks from being used without config reload

Component	Core & setup
Title	Avoid new discovered checks from being used without config reload
Date	Apr 9, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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