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Move setting the sock->write_timeout to the async_*send [v9.18]

Ondřej Surý requested to merge 3344-threadsanitizer-data-race-in-isc__nm_tcpdns_send-v9_18 into v9_18

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.

(cherry picked from commit 61117840)

Closes #3344 (closed)

Edited by Ondřej Surý

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