Add dhcp server failover support.
Add dhcp server failover support.

And the *crowd* better go nuts!

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