Remove tcpdump reader and replace with lldpd.

Make everything install and start it.

Next up will be to record neighbor output.
well, it is not as if the s3 bucket is going to run out of space.  I don't want it to be easy to update Sledgehammer, and I prefer making it smaller to making it bigger, but this lldp change is totally better than the evil things we were doing with tcpdump.