Don't load H323 conntrack modules by default.

This happens to cause trouble with transmitting the audio through
an IPsec tunnel.

http://forum.ipfire.org/index.php?topic=5459.0

src/initscripts/init.d/network

@@ -31,6 +31,8 @@ init_networking() {
 	if [ -e /var/ipfire/main/disable_nf_sip ]; then
 		rmmod nf_nat_sip
 		rmmod nf_conntrack_sip
+		rmmod nf_nat_h323
+		rmmod nf_conntrack_h323
 	fi
 
 	boot_mesg "Setting up firewall"