Werk #11997: mk_docker.py: Handle parallel calls of the plugin

Component Checks & Agents
Title mk_docker.py: Handle parallel calls of the plugin
Date Jan 25, 2021
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.0.0b5 2.1.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

The docker API will not allow parallel calls to its 'df' command. Since this command is notoriously long running, the section 'docker_node_disk_usage' was often missing if the agent has been called multiple times in parallel.

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