WIP: cache/entry_rr: restored the ability to shuffle RRs in cached answer

When enabled, it shuffles the order of records using Fisher-Yates and PRNG as an input. It does not use message ID, as it's biased. It only shuffles address types (A, AAAA) as this is only useful for legacy clients.

Thread with guidelines for shuffling wrt privacy: https://www.ietf.org/mail-archive/web/dns-privacy/current/msg01274.html