The AffectedSourceFiles query matches against files with paths relative
to repository root.  On the other hand _FindAllFiles checks white_lists
and black_lists against files paths relative to PRESUBMIT.py

As a result, when a PRESUBMIT.py is not at RepositoryRoot, RunPylint
can misbehave.

I fix this by modifying the white_lists and black_list regexes to
include the relative directory of PRESUBMIT.py.

Also adding some logging to pylint and simplified misc logic.


Review URL: https://chromiumcodereview.appspot.com/11776016

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@175364 0039d316-1c4b-4281-b951-d872f2087c98