Werk #4769: saprouter_cert: More robust detection of "not after" value

Component	Checks & agents
Title	saprouter_cert: More robust detection of "not after" value
Date	Jun 6, 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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