Mark Goddard dd1ebf20ca CI: install tox
tox will be removed from the base image. Install it before that happens.

This change is made in a simple way that can be easily backported.

Depends-On: https://review.opendev.org/713386

Change-Id: I4181654c88554c81940f0d079cf1d64326cdec79
2020-03-17 09:51:00 +00:00
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