paxos: coord: nominate only once per round
paxos: coord: nominate only once per round

jmptrader/doozerd,npchp110/doozerd,soundcloud/doozerd,rowhit/doozerd,rowhit/doozerd,soundcloud/doozerd,coreos/doozerd,jmptrader/doozer,npchp110/doozerd,tempbottle/doozerd,ha/doozerd,tempbottle/doozerd,zyxar/doozerd,bitly/doozerd,ha/doozerd,tempbottle/doozerd,soundcloud/doozerd,ylong/doozerd,npchp110/doozer,zyxar/doozerd,jmptrader/doozerd,ha/doozer,soundcloud/doozer,rowhit/doozerd,ylong/doozerd,zyxar/doozerd,ha/doozerd,coreos/doozerd,coreos/doozer,coreos/doozerd,ylong/doozerd,soundcloud/doozer,npchp110/doozerd,jmptrader/doozerd,magastzheng/doozerd,npchp110/doozerd,ylong/doozerd,jmptrader/doozerd,magastzheng/doozerd,magastzheng/doozerd,soundcloud/doozerd,tempbottle/doozerd,bitly/doozerd,rowhit/doozerd,zyxar/doozerd,bitly/doozerd,magastzheng/doozerd