gssapi: Set username via auth_request_set_username(). This makes GSSAPI also use auth_username_* settings. Also improved logging.
gssapi: Set username via auth_request_set_username().
This makes GSSAPI also use auth_username_* settings. Also improved logging.

LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot