SSH banner output

[Martin Pool]

It would probably be reasonable for paramiko to make the banner
available to bzrlib, and bzrlib to pass it to the ui.  In the short
term, if you want to give a message to people connecting to an ssh
server then just putting it into the ssh banner and letting the
current behavior take effect is fairly reasonable.

Talking to spiv yesterday we discussed extending the hpss 'hello'
command so that both the client and the server give their version
numbers, and also a dictionary of other information.  One thing that
could be in the dictionary in the response would be a motd.  This
would work over any hpss medium.

That would only be appropriate for server-wide messages, not for
messages attached to particular branches, where something like
Robert's solution could be good.

-- 
Martin