Add post tarball gate to magnum-tempest-plugin
Add post tarball gate to magnum-tempest-plugin

This commit adds a tarball post gate to the
openstack/magnum-tempest-plugin project.

Change-Id: Ib2a84a7ae57b9de87eac5d56d65f4ea63ce2f215

openstack-infra/project-config,openstack-infra/project-config