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Draft: [9.20] chg: usr: Add none parameter to query-source and query-source-v6 to disable IPv4 or IPv6 upstream queries

Colin Vidal requested to merge backport-querysource-none-9.20 into bind-9.20

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 (closed) Turning-off upstream IPv6 queries while still listening to downstream queries on IPv6.

Merge branch 'colin/querysource-none' into 'main'

See merge request !9727 (merged)

Backport of MR: !9727 (merged)

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