SCRAM-SHA-1-PLUS + SCRAM-SHA-256 and SCRAM-SHA-256-PLUS

[Neustradamus]

There is only SCRAM-SHA-1, there is not SCRAM-SHA-1-PLUS:

• https://tools.ietf.org/html/rfc5802
• https://tools.ietf.org/html/rfc6120

There is not SCRAM-SHA-256 and SCRAM-SHA-256-PLUS:

• https://tools.ietf.org/html/rfc7677
• https://tools.ietf.org/html/draft-ietf-mile-xmpp-grid

[Freyskeyd]

Will try to implement in the futur