Changelog:
=========
* Fix remaining logic to support Python 3.6/7
* Drop python3.6/3.7 support in testing runtime
* Add Python3 zed unit tests
* Update master for stable/yoga
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>