Re: Minor feature additions

[Aris Adamantiadis <aris@xxxxxxxxxxxx>]

> 1) The known hosts file: Current libssh considers it an error condition 
> if this does not exist. I don't really see why, but it causes us 
> problems on our production machines because typically no one's ever run 
> ssh on them directly before, so the file isn't there to begin with. We 
> see no reason to have to go around to every machine and ensure this file 
> exists first, so I did a simple modification in the 0.2 release that 
> changes "file not found"  in ssh_parse_knownhost() from an error 
> condition to a simple "return NULL", meaning "No match found".
>
> Could there be a simple option which determines whether not having a 
> known hosts file is a real problem?
Fixed in 052073c.
It may be a wise idea to backport it in 0.3 series since it's useful.
> 2) In getai(), it saves a lot of futile DNS querying time to do 
> something like this:
> hints.ai_flags |= AI_NUMERICHOST;

I also did a fix for AI_NUMERICSERV since we only set a numeric port value.