Werk #6792: docker_node_disk_usage: Support older Docker versions

Component Checks & agents
Title docker_node_disk_usage: Support older Docker versions
Date Oct 12, 2018
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.6.0b1
Level Trivial Change
Class New Feature
Compatibility Compatible - no manual interaction needed

Some old Docker verions do not supprt the "--format" option, which resulted in faulty or missing agent data. This has been fixed.

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