4975. [bug] The server cookie computation for sha1 and sha256 did

                        not match the method described in RFC 7873. [GL #356]

(cherry picked from commit 8755a249)
7 jobs for 356-client-cookie-is-being-hashed-twice-when-computing-the-dns-server-cookie-v9_11 in 6 minutes and 11 seconds (queued for 4 seconds)