Add function that returns the interface which belongs with the gateway
Add function that returns the interface which belongs with the gateway

NewEraCracker/pfsense,ptorsten/pfsense,pfsense/pfsense,NewEraCracker/pfsense,BlackstarGroup/pfsense,ch1c4um/pfsense,jxmx/pfsense,ptorsten/pfsense,dennypage/pfsense,pfsense/pfsense,brunostein/pfsense,dennypage/pfsense,jxmx/pfsense,BlackstarGroup/pfsense,dennypage/pfsense,ch1c4um/pfsense,ch1c4um/pfsense,NOYB/pfsense,NOYB/pfsense,phil-davis/pfsense,ch1c4um/pfsense,brunostein/pfsense,brunostein/pfsense,pfsense/pfsense,jxmx/pfsense,NewEraCracker/pfsense,ptorsten/pfsense,NewEraCracker/pfsense,phil-davis/pfsense,NOYB/pfsense,dennypage/pfsense,pfsense/pfsense,BlackstarGroup/pfsense,BlackstarGroup/pfsense,phil-davis/pfsense,phil-davis/pfsense