Patch to Prevent client from not opening channel

[David Helwig]

Hi there,
i had the problem that it wasn't possible to prevent the client from not 
opening a channel.
This is necessary for me because i have written a custom shell which is 
doing some cleanup work after the connection is closed, which is not 
possible in case the shell isn't started at all.

I have found some people with the same Problem on the internet, so i 
patched in a channelgracetime.
I have asked on the openssh irc why there isn't such a feature and 
nobody had a real answer.
If you know some reason why this is evil, and generally bad, please let 
me know.

Also as far as i'm concerned i haven't broken anything but if you see 
something really wrong please tell me.

Greetings David Helwig

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