Werk #7401: diskstat: Clean up old item states

Component	Checks & agents
Title	diskstat: Clean up old item states
Date	Apr 16, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The diskstat checks now clean up counter information that is more than ten times older than the youngest one to avoid growing up the item state.

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