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Pause the dbiterator before calling dns_db_find

Ondřej Surý requested to merge 2908-rwlock-with-reader-and-writer-both-waiting-v9_16 into v9_16

zone.c:integrity_checks() acquires a read lock while iterating the zone database, and calls zone_check_mx() which acquires another read lock. If another thread tries to acquire a write lock in the meantime, it can deadlock. Calling dns_dbiterator_pause() to release the first read lock prevents this.

(cherry picked from commit 4e1faa35)

Closes #2908 (closed)

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