[RFC] 'failok' mount(8) flag

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Hi,

I think sometimes it's desirable to mark a few file systems as 'failok',
which means it's Ok to have these mounts failed on boot and something
else (a script, cron job, etc) will handle the case.

Here is a proposed patch to implement that, I'll document it if there is
no objection on the functionality itself.

Cheers,
- -- 
Xin LI <delphij_at_delphij.net>	http://www.delphij.net/
FreeBSD - The Power to Serve!	       Live free or die
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