* Fix var precedence check to support python 3.
* Run CI sanity tests using python 3.5.
* Disable pylint non-iterator-returned test to pass on python 3.5.
(cherry picked from commit e7bb508ad6)
* Fix var precedence check to support python 3.
* Run CI sanity tests using python 3.5.
* Disable pylint non-iterator-returned test to pass on python 3.5.
(cherry picked from commit e7bb508ad6)