Use templates for cover and lower-constraints
Use templates for cover and lower-constraints

Use openstack-tox-cover template, this runs the cover job
in the check queue only.

Use openstack-lower-constraints-jobs template.

Remove jobs that are part of the templates.

Change-Id: I21efefc2e85c57d754b272b02de694f5c6a6edfd

openstack/kuryr,openstack/kuryr