Add a comment about CARP in generated rules
Add a comment about CARP in generated rules

Currently the rules.debug file looks like this:
```
# Snort package
block log quick from <snort2c> to any tracker 1000000109 label "Block snort2c hosts"
block log quick from any to <snort2c> tracker 1000000110 label "Block snort2c hosts"
block in log quick proto carp from (self) to any tracker 1000000201
pass  quick proto carp tracker 1000000202 no state
```

This made me wonder which weird things snort is doing there. Turns out it was not snort.
dennypage/pfsense,pfsense/pfsense,pfsense/pfsense,pfsense/pfsense,dennypage/pfsense,NewEraCracker/pfsense,NewEraCracker/pfsense,NewEraCracker/pfsense,dennypage/pfsense,NewEraCracker/pfsense,dennypage/pfsense,pfsense/pfsense