Add check for required fields for PPP connections.
Add check for required fields for PPP connections.

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