Also fix the tests. New implementation tested with GNU libmicrohttpd.
The new numbers in tests are real SHA-512/256 numbers (not just some
random ;) numbers ).
RFC 7616 section 3.4 (The Authorization Header Field) states that "For
historical reasons, a sender MUST NOT generate the quoted string syntax
for the following parameters: algorithm, qop, and nc". This removes the
quoting for the algorithm parameter.
Reviewed-by: Steve Holme
Closes#4890
