Add support for Delegated-IPv6-Prefix to RADIUS hook

Currently, the RADIUS hook can create a reservation for an IP address based on the content of framed-ipv6-address (https://www.rfc-editor.org/rfc/rfc6911#section-3.1) in the access-accept response. It would be nice to also be able to create a reservation for a prefix based on the content of delegated-ipv6-prefix (https://www.rfc-editor.org/rfc/rfc4818) in the access-accept response.

RT22056

Edited Aug 01, 2023 by Francis Dupont

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