Update dependencies on gsutil and boto, to be able to use gsutil ls gs://bucker/dir feature
Update dependencies on gsutil and boto, to be able to use gsutil ls gs://bucker/dir feature

I only tested the change on mac, loccaly
Review URL: https://codereview.appspot.com/6576055

git-svn-id: 32fc27f4dcfb6c0385cd9719852b95fe6680452d@5711 2bbb7eff-a529-9590-31e7-b0007b416f81

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot