Werk #13402: docker_container_diskstat: fix stale service

Component	Checks & agents
Title	docker_container_diskstat: fix stale service
Date	Nov 25, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p19 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The "Disk IO" services failed to display any values and were permanently stale.

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