The old method of executing tempest via run_tempest.sh from
the root of the git clone has been deprecated and will soon
be removed.
This patch does the following:
- Implements the updated method of executing tempest using
the foundation laid down in https://review.openstack.org/382211
TODO in a follow-on patch:
When executed in CI, fetch the results for storage with other test
artifacts.
Change-Id: I8f3c58d670a335323be34ac4318b93c928b878cb
485100fbd3