module: make sure same realpath file only load once
Keep require cache effect as same as before on same realpath.
Fixes: https://github.com/nodejs/node/issues/3402#issuecomment-215046970
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Keep require cache effect as same as before on same realpath.
Fixes: https://github.com/nodejs/node/issues/3402#issuecomment-215046970