Run Python 3.5 tests with 3.5.2 (#1482)
Run Python 3.5 tests with 3.5.2 (#1482)

* Run Python 3.5 tests with 3.5.2

* Add return statement

* Allow 3.5.2 only for linux

* Fix typo

* Address  review comment

* Address  review comment
GoogleCloudPlatform/gsutil,GoogleCloudPlatform/gsutil