Werk #5094: lnx_distro: Prefers /etc/os-release if available which is systemd-supported

Component	HW/SW inventory
Title	lnx_distro: Prefers /etc/os-release if available which is systemd-supported
Date	Aug 10, 2017
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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