Werk #6832: docker_node_info: Support old Docker versions

Component	Checks & agents
Title	docker_node_info: Support old Docker versions
Date	Oct 17, 2018
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0p7 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Fixed incompatibility with old Docker versions not supporting the "--format" option, which resulted in faulty or missing agent data.

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