Integration tests suite using Test Kitchen

Work in progress, still needs many things.

- [ ] Shut off service enabling under integration test (requires a real token).
- [ ] Test integration of data bag
- [ ] Test integration of encrypted data bag
- [ ] Test configuration of token
- [ ] Test configuration of [hostname](https://docs.newrelic.com/docs/server/changing-the-linux-server-name#configuration-file)