Use openstack-tox-cover template
Use openstack-tox-cover template

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

Remove jobs and use template instead.

Change-Id: I347ba793764073f46731a8953030976188e1a1c4

openstack/tricircle,openstack/tricircle,stackforge/tricircle,stackforge/tricircle