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We already copy authorizer_reply_buf and authorizer_reply_buf_len into
ceph_connection.  Factoring out __prepare_write_connect() requires two
more: authorizer_buf and authorizer_buf_len.  Store the pointer to the
handshake in con->auth rather than piling on.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Sage Weil <sage@redhat.com>