cfs on netbsd

[Steve Bellovin <smb%research.att.com@localhost>]

I finally figured out why I had to do the 'mount' to 127.0.0.1 instead
of localhost:  in my /etc/hosts file, ::1 is the first-listed entry
for localhost, so it was trying to use v6 instead of v4 to contact
cfsd.

Just why the v6 address should be listed first is a separate question,
of course...  And I won't bother updating the README.netbsd file
because there's not a clean work-around other than doing what I
did.  (I suppose one could add 'localhost-v4' to /etc/hosts, but it
hardly seems worth it.)