Initial fork of certbot-dns-servfail; talks to the yeil dns-server RPC
DNS-01 authenticator that walks up the labels of the validation name, calls findzone on the dns-server RPC to locate the registered parent zone, then addrecord/deleterecord around the TXT challenge. Auth is HTTP Basic with the shared rpc key (matches the protocol the yeil DNS web app uses in dns/src/lib/rpc.ts).
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