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Rework isccc_ccmsg to support multiple messages per tcp read

Ondřej Surý requested to merge 4416-fix-reading-multiple-rndc-messages-in-single-TCP-message into main

Previously, only a single controlconf message would be processed from a single TCP read even if the TCP read buffer contained multiple messages. Refactor the isccc_ccmsg unit to store the extra buffer in the internal buffer and use the already read data first before reading from the network again.

Co-authored-by: Ondřej Surý ondrej@isc.org Co-authored-by: Dominik Thalhammer dominik@thalhammer.it

Closes #4416 (closed)

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