Add a none parameter to named configuration option `query-source` (respectively `query-source-v6`) which forbid usage of IPv4 (respectively IPv6) addresses when named is doing an upstream query.
Closes #4981 Turning-off upstream IPv6 queries while still listening to downstream queries on IPv6.
Merge branch 'colin/querysource-none' into 'main'
See merge request isc-projects/bind9!9727