Get syslog facility from ENV var

def get_syslog_facility():
    """Get syslog facility from ENV var"""
    facil = os.getenv('WALE_SYSLOG_FACILITY', 'user')

    valid_facility = True
    try:
        facility = handlers.SysLogHandler.facility_names[facil.lower()]
    except KeyError:
        valid_facility = False
        facility = handlers.SysLogHandler.LOG_USER

    return facility, valid_facility