Remove tcpdump reader and replace with lldpd.

Make everything install and start it.

Next up will be to record neighbor output.
Nah, I am fine with the changes to sledgehammer -- I was just noting that it would be easier to test if you went ahead and generated a new kernel and initrd pair, put them in the S3 bucket (after testing), and update the bootstrap with the new signatures.

tools/build_sledgehammer will generate the new kernel/initrd pair and spit out the signature you should use.