Prevent configuring the same parent and VLAN ID multiple times. Ticket #6183
Prevent configuring the same parent and VLAN ID multiple times. Ticket #6183

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