* Replace .testr.conf by .stestr.conf for migration and update
.gitignore, test-requirements.txt and lower-constraints.txt
files accordingly
* Use py3 as the default runtime for tox and 3.18.0 as the
minversion for tox
* Add a new job, openstack-cover-jobs, to run the coverage in Zuul
* Create cover environment in tox and make relevant changes
in .gitignore
Signed-off-by: HeroicHitesh <email.hiteshkumar@gmail.com>
Change-Id: I3de659cdda2f490590dbfb38c81b95becac5da7c