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Move setting the sock->write_timeout to the async_*send

Ondřej Surý requested to merge 3344-threadsanitizer-data-race-in-isc__nm_tcpdns_send into main

Setting the sock->write_timeout from the TCP, TCPDNS, and TLSDNS send functions could lead to (harmless) data race when setting the value for the first time when the isc_nm_send() function would be called from thread not-matching the socket we are sending to. Move the setting the sock->write_timeout to the matching async function which is always called from the matching thread.

Closes #3344 (closed)

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