Currently the "Generate tempest accounts.yaml file" task uses tempest
that was installed as a dependency for python-tempestconf.
If we want to propagate fixes for account-generator more quickly into
the ansible-role-refstack-client it would probably be better to use
tempest installed by setup_env (we do not have to wait for another
tempest release in pypi).
Change-Id: I2a3cdca3b2b26946d6e5f910527ad1c7ada9b202
766ddffc5c