add consts for hashes and test hash of argon2d
add consts for hashes and test hash of argon2d

The resulting hashes for argon2d and
argon2i are now defined in a central place.
Furthermore, the argon2d hash is now tested
as well.

ranisalt/node-argon2,markfejes/node-argon2,ranisalt/node-argon2,markfejes/node-argon2,markfejes/node-argon2,ranisalt/node-argon2