Werk #5561: Add build support for SLES12SP3

Component	Linux distributions
Title	Add build support for SLES12SP3
Date	Dec 1, 2017
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i2 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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