Werk #12308: adapt calculation of memory usage to match docker 20.10

Component Checks & Agents
Title adapt calculation of memory usage to match docker 20.10
Date Mar 15, 2021
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.1.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

Docker 20.10 changed the way how memory usage of docker containers is calculated, the docker check was adapted accordingly.

See https://github.com/docker/cli/pull/2415 for more information.

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