[PATCH] Make config parser more strict to ip:port values (bz2335)

[Jakub Jelen]

Hello,
I have there another small contribution for openssh project and since I 
don't have any other responses for the previous I will not be such 
verbose like last time.

In short, openssh config parser doesn't do what it is supposed to do 
(based on man pages) and this behaviour is quite confusing so I would 
like to push this modification into upstream.

Finally, link to bugzilla:
https://bugzilla.mindrot.org/show_bug.cgi?id=2335

I hope everything is clear and if not, I'm open to discussion.

Best regards,
Jakub Jelen