Werk #3357: Fixed service conditions of Disk IO related rulesets

Component	Setup
Title	Fixed service conditions of Disk IO related rulesets
Date	Apr 1, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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