Werk #10817: check_dns: Act case-insensitive

Component	Checks & agents
Title	check_dns: Act case-insensitive
Date	Feb 20, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p10 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p25 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

When comparing the answer from DNS, check_dns always acts case-sensitive. That means, it marks answers as CRITICAL, when for instance the hostname in check-mk is lowercase and the answer comes as uppercase. This has been fixed.

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