qa_openstask.sh: Use Heat for TESTVM verification
qa_openstask.sh: Use Heat for TESTVM verification

This significantly increases test coverage

SUSE-Cloud/automation,aspiers/automation,SUSE-Cloud/automation,gosipyan/automation,aspiers/automation,gosipyan/automation,SUSE-Cloud/automation,vmoravec/automation,aspiers/automation,gosipyan/automation,SUSE-Cloud/automation,gosipyan/automation,vmoravec/automation,vmoravec/automation,aspiers/automation,vmoravec/automation