Also fixes tox env for py38-consul tests
Update zuul script to use consul 1.7.4 (2020) vs 0.6.3 (2016)
Adds ACL tokens to all session management calls.
Change-Id: Iaddf21f14c434129541e7c9ec7134e0661f7be52
os-testr is only needed to provide the "subunit-trace" command which
is used in the tools/pretty_tox.sh script. And pretty_tox.sh is not
needed. "stestr" can be used directly in tox.ini. So drop
tools/pretty_tox.sh .
Change-Id: I6a18183f092689c8c9d283c19914da9baa59cc32