pfSense

This is follow-up from http://redmine.pfsense.org/issues/1297
Basically the default /etc/bogons is fairly out-of-date, so when you have built and boot up your first firewall, you might me scratching your head for a good few hours, wondering why some networks are being blocked. Then out of the sudden, they will be allowed, that's when /etc/rc.update_bogons.sh kicks in from cron. I have learnt in the hard way.

I would like to propose the following changes:
1. most recent "bogons" to be included in next and every new release
2. /etc/bogons to be updated at boot time
3. the update script to fall back to hardcoded IP, if DNS is not available