ifconfig AF

[Alfred Morgan]

I ran the command ifconfig re0 autoconf and found an error message saying
"autoconf not allowed for this AF" and it took me some time searching to
figure out what "AF" meant. After I found out that it meant "address
family" I used the inet6 syntax. I think it would be useful to change the
error message to say "address family" instead of "AF". If you require a
diff for the source code changes then let me know.
-- 
-alfred