oneshot: add kresd migration notification
This oneshot script prints notification in case that user is using old knot-resolver API in custom configuration. https://knot-resolver.readthedocs.io/en/stable/upgrading.html#configuration-file
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This oneshot script prints notification in case that user is using old knot-resolver API in custom configuration. https://knot-resolver.readthedocs.io/en/stable/upgrading.html#configuration-file