Return what would be written to disk for interfaces

def _read_temp_ifaces(iface, data):
    '''
    Return what would be written to disk for interfaces
    '''
    try:
        template = JINJA.get_template('debian_eth.jinja')
    except jinja2.exceptions.TemplateNotFound:
        log.error('Could not load template debian_eth.jinja')
        return ''

    ifcfg = template.render({'name': iface, 'data': data})
    # Return as an array so the difflib works
    return [item + '\n' for item in ifcfg.split('\n')]