Integrate contrib byacc tests into kyua (DO NOT MERGE; for review purposes only)

- Add a simple driver for run_test.sh which sets up the required environment to run run_test.sh
- Install [most] of the passing testcases from contrib/byacc. The rest of the working testcases will need to be picked up from the byacc-20140715 snapshot.

This fixes PR 191020, and gets things on the path of having a working test suite/green runs on FreeBSD with Kyua.