Werk #8755: fixed statgrab_disk: Now computes rate correctly

Component	Checks & agents
Title	fixed statgrab_disk: Now computes rate correctly
Date	Feb 23, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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