This suite is very slow (26s), while the rest of the test suites
are fast.. Since subprocess2 is a relatively static module,
blacklist the suite for upload.


Review URL: https://chromiumcodereview.appspot.com/12544027

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@188657 0039d316-1c4b-4281-b951-d872f2087c98