Add gclient_smoketest.py to PRESUBMIT.py check
Add gclient_smoketest.py to PRESUBMIT.py check

It raises the time to run the presubmit to ~30 seconds but it's still worth.

TEST=run more often

Review URL: http://codereview.chromium.org/3146010

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@55759 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

svn2github/chromium-depot-tools,svn2github/chromium-depot-tools,svn2github/chromium-depot-tools