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Refactor dns_badcache to use cds_lfht lock-free hashtable

Ondřej Surý requested to merge 4223-replace-dns_badcache-hashtable-implementation into main

The dns_badcache unit had (yet another) own locked hashtable implementation. Replace the hashtable used by dns_badcache with lock-free cds_lfht implementation from liburcu.

Closes #4223 (closed)

Edited by Ondřej Surý

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