Add the name and the type of KiwiAuthBackend's function. Hope they won't change...
Well, it changed.
Add a rewriting of the login handler since the auth's one can't be used (because of password encryption). Also save the salt inside the userMeta field (because there isn't an other way to store information when we have loose the KiwiAuthManager type, and there is nothing in IAtuhBackend to replace how the password is crypted.