Radosław Piliszek 83bc574ba5 Cleanup py27 support
Removes and/or replaces all mentions of py27.

Cleans up obsolete requirements and their lower-constraints.

Update cliff minimum to 3.1.0 in requirements.txt, which has a fix for
story 2005891.

Change-Id: I52cffa2f1aee944f79c4618ea20b779755792f2a
2020-04-20 18:04:19 +00:00
..
2020-04-20 18:04:19 +00:00