Werk #1740: Changed default service discovery check intervall to 12 hours

Component	Core & setup
Title	Changed default service discovery check intervall to 12 hours
Date	Dec 11, 2014
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.6b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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