qa_crowbarsetup: make crowbar calls safely to fail early
qa_crowbarsetup: make crowbar calls safely to fail early

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