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[v9_18] After dig request errors, try to use other servers when they exist

Arаm Sаrgsyаn requested to merge 3128-dig-does-not-recover-from-a-isc_nm_udpconnect-failure-v9_18 into v9_18

When timing-out or having other types of socket errors during a query, dig isn't trying to perform the lookup using other servers which exist in the lookup's queries list.

After configured amount of timeout retries, or after a socket error, check if there are other queries/servers in the lookup's queries list, and start the next one if it exists, instead of unconditionally failing.

Closes #3128 (closed)

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