Allow user to set failover sync ip.  Requires a carp entry so that we can deterimine the ADV Skew and detect if it should be primary or backup.
Allow user to set failover sync ip.  Requires a carp entry so that we can deterimine the ADV Skew and detect if it should be primary or backup.

Beginnings of Ticket #380

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