Add new default siphash24 cookie algorithm
This commit changes the BIND cookie algorithms to match draft-sury-toorop-dnsop-server-cookies-00. Namely, it changes the Client Cookie algorithm to use SipHash 2-4, adds the new Server Cookie algorithm using SipHash 2-4. The change doesn't make the SipHash 2-4 to be the default algorithm, this is up to the operator.
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