dns: add 'dns_resolved_add_remove_ipv6_dns' test
Check that if systemd-resolved is enabled as dns manager NM adds and removes IPv6 dns entries correctly.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
Check that if systemd-resolved is enabled as dns manager NM adds and removes IPv6 dns entries correctly.