Werk #7449: Fix Remove spurious perfdata in IF checks

Component	Checks & agents
Title	Fix Remove spurious perfdata in IF checks
Date	Aug 5, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0b5 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p22 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Remove repeated in & out perf data values Remove perfdata for averaged average

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