Fix #7183 Do not allow Interface Groups with the same name
Fix #7183 Do not allow Interface Groups with the same name

I should stop trying bad stuff, there seem to be so many holes to find in the validation :)
jxmx/pfsense,NOYB/pfsense,pfsense/pfsense,NOYB/pfsense,phil-davis/pfsense,NewEraCracker/pfsense,brunostein/pfsense,dennypage/pfsense,phil-davis/pfsense,NewEraCracker/pfsense,NewEraCracker/pfsense,jxmx/pfsense,dennypage/pfsense,brunostein/pfsense,ptorsten/pfsense,jxmx/pfsense,phil-davis/pfsense,phil-davis/pfsense,pfsense/pfsense,pfsense/pfsense,NewEraCracker/pfsense,ptorsten/pfsense,brunostein/pfsense,pfsense/pfsense,NOYB/pfsense,dennypage/pfsense,dennypage/pfsense,ptorsten/pfsense