Implement SASL LOGIN authentication.
LOGIN is a non-standard SASL authentication mechanism, described in the now-abandoned draft-murchison-sasl-login-*.txt
We issue the standard "User Name" and "Password" challenges, not the permitted alternative "Username:" and "Password:".
(This class is not named just "Login" because of the IMAP command of the same name.)
Creates a new SaslLogin object on behalf of c.
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