Integrate contrib byacc tests into kyua (for review)

- Add a simple driver for run_test.sh which sets up the required environment to run run_test.sh
- Install the passing testcases from contrib/byacc. Some of the testcases will need to be adjusted to work with the FreeBSD installed program/kyua.

This fixes PR 191020, and gets things on the path of having a working test suite/green runs on FreeBSD with Kyua.