Update pflua deps

* deps/pflua: Update
Add bench.lua for simple benchmarking

* src/bench.lua: New file.
Add csv2 makefile target

* src/ts/pcaps/igalia/one-gigabyte.pcap.tests: New file.
* src/Makefile: Add csv2 makefile target.

* src/bench.lua: Add iterations arg, and flush IO so we can see things.