Werk #7156: Dropping support for Ubuntu 17.10

Component	Linux distributions
Title	Dropping support for Ubuntu 17.10
Date	May 8, 2019
Level	Major Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Ubuntu 17.10 is End of Life. Therefore we stop supporting this Distro.

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