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Avoid false positive in serve-stale system test check

Nicki Křížek requested to merge 4117-serve-stale-check into main

The purpose of the check is to verify the server has survived the previous barrage of queries. This is done by sending a query and checking we get a NOERROR response back.

Previously, that query could've been affected by a servfail cache - the server would return a SERVFAIL answer, thus failing the check, despite being up and running. Use version.bind txt ch query to avoid the interference of servfail cache.

Closes #4117 (closed)

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