This patch makes some changes to the cpplint.py script for integration
with the VSCode cpplint plugin, available here:

https://marketplace.visualstudio.com/items?itemName=mine.cpplint

Specifically, the "--repository" and "--headers" options currently cause
our version of cpplint to crash, when we should at worst ignore them. A
minor messaging tweak outputting the contents of the GetoptError, to
make debugging input argument bugs easier, is included

Change-Id: Id78616f5e2fdecb7da650042f0658623477ef9cb
Reviewed-on: https://chromium-review.googlesource.com/c/1481938Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Jordan Bayles <jophba@chromium.org>