Add backend code for NAT reflection on 1:1 NAT mappings.
Add backend code for NAT reflection on 1:1 NAT mappings.

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