dns module: fix compatibility with kresd 5 packaging
Tested on RC 3.x Omnia (rewriting the script by hand).
Fixes https://gitlab.labs.nic.cz/turris/diagnostics/issues/19 for 3.x
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Tested on RC 3.x Omnia (rewriting the script by hand).
Fixes https://gitlab.labs.nic.cz/turris/diagnostics/issues/19 for 3.x