Update benchmarks

This updates the benchmarks to make them relative to the current
machine being tested on. This is setup for bringing in a new
`DatWorkerPool` and making sure there are no performance issues.

/cc @kellyredding
Update to the latest `DatWorkerPool`

This updates `DatTCP` to work with the latest `DatWorkerPool`. This
involved calling the `start` method on the worker pool after its
been created. Previously, it automatically started when it was
built. This also runs the benchmarks to ensure there are no
performance degradations.