/etc/netstart can parse /etc/ifaliases and $ifaliases_ifname.
	The parsing code in /etc/netstart is hardcoded to IPv4 (I mean,
	use of "inet").  Isn't it more correct to let user specify the address
	family portion?  I would like to allow "inet6" at least.
	It would be nice if we can say "prefixlen" instead of "netmask".

	I admit there will be backward compatibility issue in
	$ifaliases_ifname case (because it chops the string into tokens
	and use every two pairs as argument).  Let me know this should be
	modified.  $ifaliases6_ifname is not nice...

itojun