Werk #7490: mk_logwatch: enforce utf-8 encoding of config files

Component	Checks & agents
Title	mk_logwatch: enforce utf-8 encoding of config files
Date	Jun 25, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Incompatible - Manual interaction might be required
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0b3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Previously it was merely assumed that the config files are utf-8 encoded. To properly address issues with matching of non-ASCII characters we now require that the config files are utf-8 encoded.

Configuration files that cannot be decoded will be skipped, and the corresponding service will go to {{UNKNOWN}}, displaying an appropriate message.

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