[$] Fedora and fallback DNS servers

One of the under-the-hood changes in the Fedora 33 release was a switch tosystemd-resolved for the handling of DNS queries. This change shouldbe invisible to most users unless they start using one of the new featuresprovided by systemd-resolved. Recently, though, the Fedora project changedits default configuration for that service to eliminate fallback DNSservers - a change which is indeed visible to some users who have foundthemselves without domain-name resolution as a result.