doc,tools,test: lint doc-based addon tests

PR-URL: https://github.com/nodejs/node/pull/5427
Fixes: https://github.com/nodejs/node/issues/5424


Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>