testing: update the python versions in the Dockerfile#4123

Merged

tmatsuo merged 3 commits intoGoogleCloudPlatform:masterfrom

tmatsuo:python-versions

Jun 19, 2020

Commits on Jun 18, 2020

testing: update the python versions in the Dockerfile
Takashi Matsuo
committed
use Python 2.7.18
Takashi Matsuo
committed

Commits on Jun 19, 2020

ensure build failure upon signature verification failure
Takashi Matsuo
committed