This removes the DNS_SERVER_FEATURE_LEVEL_LARGE, and sets the EDNS0 advertised max packet size as if always in 'large' mode. Without this, we always send out EDNS0 opts that limit response sizes to 512 bytes, thus the remote server will never send anything larger and will always truncate responses larger than 512 bytes, forcing us to drop from EDNS0 down to TCP, even though one of the primary benefits of EDNS0 is larger packet sizes. Fixes: #20993
System and Service Manager
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