Summary:
Previous our new `arc lint` has two annoying bugs:
* Keeping sending false alarm that we'd put c++ system files first -- even though we've already done that.
- this problem is caused by our linter, which doesn't give the underlying cpplint.py right file path (it gives "-" as file name), making cpplint.py work incorrectly.
* Only works in rocksdb's root dir; Otherwise it'll throw exception saying "cannot find cpplint.py".
I copied open source ArcanistCpplintLinter and modifiy it for our use.
Test Plan: Ran arc lint and made sure the above-mentioned problem won't occur.
Reviewers: haobo, sdong, igor, ljin, yhchiang, dhruba
CC: leveldb
Differential Revision: https://reviews.facebook.net/D16137
