This updates the Habitat plugin by doing the following:
- Removing `settings.sh` in favor of Habitat config TOMLs
- Changing deprecated `--format` to `--reporter`
- Cleaning up plan.sh in several ways
- Adding handling for different exit codes
- Removing unnecessary runtime deps
- Vendoring the InSpec archive during build
- Using shebangs that reference Habitat's bash
- Adding error handling for `hab studio enter`/`build` from `habitat/`
- Making `pkg_svc_user` use default `hab` and not `root`
Signed-off-by: Jerry Aldrich <jerryaldrichiii@gmail.com>
