~/.hosts patch

Hey folks, got an interesting patch.  This adds a ~/.hosts file  
(personal version of /etc/hosts).  It was written against 6-STABLE  
about a week before 6.1 was released, and has been sitting collecting  
dust for the last month and a half.  Currently it augments /etc/hosts  
instead of replacing it or prepending it.  Any comments?  One  
suggestion that was made was to make it an nss module so that it  
could be controlled by the admin.  It probably could use some cleanup  
as well, just putting it out here for proof of concept for now, and  
some direction.

- Justin