Werk #6944: docker_node_info: FIX missing keys for docker versions on CentOS 6

Component	Checks & agents
Title	docker_node_info: FIX missing keys for docker versions on CentOS 6
Date	Dec 6, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p10 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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