Use "ifconfig -l" instead of "list_network_interfaces all" in

ifnet_rename() to support situations where rc.conf's $network_interfaces
variable is set to an explicit list of network interfaces (instead of
the default "auto").

Using "list_network_interfaces all" resulted in using
$network_interfaces for both interface _renaming_ and interface
_configuration_ which obviously cannot work either before (if the
new name is in $network_interfaces) or after (if the old name is in
$network_interfaces) renaming the interface.

etc/network.subr

@@ -256,7 +256,7 @@ ipx_down()
 ifnet_rename()
 {
 
-	_ifn_list="`list_net_interfaces all`"
+	_ifn_list="`ifconfig -l`"
 	[ -z "$_ifn_list" ] && return 0
 	for _if in ${_ifn_list} ; do
 		eval _ifname=\$ifconfig_${_if}_name