make miniupnpd listen on interface instead of IP

The 'listening_ip' option in miniupnpd.conf can accept an interface name
directly instead of having to translate it to an IPv4 address first. (This is
actually required if IPv6 support is enabled.)
Merge pull request #1122 from razzfazz/miniupnp_listen_on_interface
Correct the ridirection URL to unbreak ones passed through Radius attributes and repsect user choices. Reported-by: Antoine Guillemot
Move clog from /usr to /usr/local

Conflicts:
	etc/inc/filter_log.inc
	etc/inc/system.inc
	etc/rc
	usr/local/www/guiconfig.inc