Werk #4982: zypper: Made check more robust against different SLES 12 service packs

Component	Checks & agents
Title	zypper: Made check more robust against different SLES 12 service packs
Date	Jul 24, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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