Remove testscenarios load_tests
Remove testscenarios load_tests

A load_tests call sneaked in test_provider_template, but it's become
useless since we switch to a base heat test class that provides what's
needed.

Change-Id: Ie5665cbbafb46a7ed63ada37a3f4aa5c74cdb8b6

redhat-openstack/heat,jasondunsmore/heat,srznew/heat,noironetworks/heat,pratikmallya/heat,dims/heat,pshchelo/heat,gonzolino/heat,pshchelo/heat,noironetworks/heat,cryptickp/heat,takeshineshiro/heat,rh-s/heat,openstack/heat,openstack/heat,maestro-hybrid-cloud/heat,redhat-openstack/heat,miguelgrinberg/heat,srznew/heat,dims/heat,maestro-hybrid-cloud/heat,takeshineshiro/heat,jasondunsmore/heat,steveb/heat,steveb/heat,rdo-management/heat,rdo-management/heat,cryptickp/heat,cwolferh/heat-scratch,gonzolino/heat,dragorosson/heat,rh-s/heat,dragorosson/heat,cwolferh/heat-scratch,pratikmallya/heat,miguelgrinberg/heat