Add round-robin method
Add round-robin method

Ticket #626

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