[ietf-nntp] Initial greeting 400 v 502

[Clive D.W. Feather]

Russ Allbery said:
> How about this:
> 
>     400 SHOULD be used if the client is only temporarily not permitted to
>     interact with the server (because of load, for example).  502 MUST be
>     used if the client is not permitted under any circumstances to
>     interact with the server, or if the server does not have sufficient
>     information to determine whether the denial of authorization is
>     temporary or permanent.

Almost what I wanted, thanks. Here's what I've actually put:

    Otherwise the server MUST present a 400 or 502 greeting code and
    then immediately close the connection.  400 SHOULD be used if the
    issue is only temporary (for example, because of load) and the
    client can expect to be able to connect successfully at some point
    in the future without making any changes.  502 MUST be used if the
    client is not permitted under any circumstances to interact with
    the server, and MAY be used if the server has insufficient information
    to determine whether the issue is temporary or permanent.

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