JR Dalrymple / pf_interface_usage

Need to add error checking for the -b argument and lots of other stuff, coming along though

Pulls in the data and prints out some useful junk - gotta add a couple of metrics to the tmp file so that it can handle situations where the snmp counter rolls or is reset

Next commit will have the bash script removed

It ocurred to me that saving a state file on the pf hosting machine is going to be dangerous and as such we're going a whole new route.

Just using plain old SNMP so it should work against non PF routers when I'm done making it more useful to the community at large.

copied useful parts of old check into new check and deleted old check

Next step is to dive into the when to reset logic