authority.v2: optimize code paths (raw_result, nonce)
authority.v2: optimize code paths (raw_result, nonce)

raw_result does not need an extra return, dicarding the nonce at that
point would discard the newer nonce from the response and also the first
nonce is gotten implicitly with the first request acme anyway

davidklaftenegger/acertmgr,moepman/acertmgr