Helps scanning faster. colorma is already slightly used by gclient but wasn't
by git-cl yet.

Update a unit test to be stricter, it was caught in the cross fire as colorma
hooks sys.stdout and stderr.

R=iannucci@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/15025003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@198689 0039d316-1c4b-4281-b951-d872f2087c98