qa_crowbarsetup: use generic function to check the installer
qa_crowbarsetup: use generic function to check the installer

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