Do not allow to add a vlan tag on the same interface when it is used by qinq.
Do not allow to add a vlan tag on the same interface when it is used by qinq.

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