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fix: usr: Fix nsupdate hang when processing a large update

Matthijs Mekking requested to merge 4910-nsupdate-hangs-when-processing-large-update into main

To mitigate DNS flood attacks over a single TCP connection, we throttle the connection when the other side does not read the data. Only a server-side socket will restart reading on the connection. Since nsupdate is the client, when it starts throttling the connection, it never attempts to read again. This has been fixed.

Closes #4910

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