Use all possible kenv variables to detect serial
Use all possible kenv variables to detect serial

dennypage/pfsense,NewEraCracker/pfsense,phil-davis/pfsense,pfsense/pfsense,phil-davis/pfsense,NewEraCracker/pfsense,phil-davis/pfsense,dennypage/pfsense,dennypage/pfsense,NewEraCracker/pfsense,NewEraCracker/pfsense,pfsense/pfsense,phil-davis/pfsense,pfsense/pfsense,dennypage/pfsense,pfsense/pfsense