raft: forbid to use none as id
raft: forbid to use none as id

jchauncey/etcd,armstrongli/etcd,lumjjb/etcd,gouyang/etcd,wowsoso/etcd,gae123/etcd,bluebreezecf/etcd,coreos/etcd,csuideal/etcd,junxu/etcd,ajityagaty/etcd,axingblog/etcd,tamird/etcd,jonboulle/etcd,kkaneda/etcd,spacejam/etcd,polvi/etcd,bdarnell/etcd,wfxiang08/etcd,mkumatag/etcd,visheshnp/etcd,glensc/etcd,rnaveiras/etcd,polvi/etcd,etcd-io/etcd,chai2010-playground/etcd,crandles/etcd,sebrandon1/etcd,bspline/etcd,ravigadde/etcd,dannysauer/etcd,ylong/etcd,wantonsolutions/dinv-etcd,YuleiXiao/etcd,hongchaodeng/etcd,whuwxl/etcd,rchicoli/etcd,ajityagaty/etcd,jlamillan/etcd,bspline/etcd,elimisteve/etcd,sofuture/etcd,improbable-io/etcd,zaphod-concur/etcd,mitake/etcd,jchauncey/etcd,pengzj/etcd,mqliang/etcd,sebrandon1/etcd,es-chow/etcd,barakmich/etcd,nekto0n/etcd,devfreesg/etcd,gtank/etcd,qqsun8819/etcd,siddontang/etcd,dannysauer/etcd,chipironcin/etcd,chai2010-playground/etcd,buaazp/etcd,etcd-io/etcd,mkumatag/etcd,steveeJ/etcd,sinsharat/etcd,bluebreezecf/etcd,njharman/etcd,xdlinear/etcd,armstrongli/etcd,hpcloud/etcd,pauldallen/etcd,Timer/etcd,asim/etcd,plasticbox/etcd,dalanlan/etcd,nieanan/etcd,insequent/etcd,SivagnanamCiena/etcd,jeremyeder/etcd,iamqizhao/etcd,plasticbox/etcd,Yhgenomics/etcd,vimalk78/etcd,msanterre/etcd,xueshanf/etcd,cchamplin/etcd,li-ang/etcd,fasaxc/etcd,hroyrh/etcd,cognusion/etcd,sayden/etcd,svdata/etcd,nkhare/etcd,freeloop1114/etcd,justintung/etcd,handsomesun/etcd,fasaxc/etcd,olark/etcd,QuantiumTechnology/etcd,yudai/etcd,shafreeck/etcd,a-robinson/etcd,mgoelzer/etcd-fork2,xychu/etcd,imzhulei/etcd,kkaneda/etcd,sofuture/etcd,qqsun8819/etcd,TheHippo/etcd,cchamplin/etcd,xiang90/etcd,jmptrader/etcd,mqliang/etcd,joshix/etcd,endocode/etcd,glensc/etcd,shakefu/etcd,handsomesun/etcd,youxidev/etcd,dterei/etcd,junxu/etcd,westhood/etcd,insionng/etcd,YuleiXiao/etcd,pigfoot/etcd,mwitkow-io/etcd,snailwalker/etcd,SivagnanamCiena/etcd,delkyd/etcd,xueshanf/etcd,mwitkow/etcd,wantonsolutions/dinv-etcd,Eagle-X/etcd,fgbreel/etcd,gouyang/etcd,crandles/etcd,StorReduce/etcd,sinsharat/etcd,rnaveiras/etcd,gyuho/etcd,steveeJ/etcd,gityf/etcd,rnaveiras/etcd,jmptrader/etcd,Timer/etcd,westhood/etcd,Yhgenomics/etcd,mwitkow/etcd,hpcloud/etcd,giantswarm/etcd,sebschrader/etcd,njharman/etcd,tempbottle/etcd,bakins/etcd,glycerine/etcd,olark/etcd,wfxiang08/etcd,OyTao/etcd_learning,mitake/etcd,chenbaihu/etcd,tamird/etcd,tguangch/etcd,purpleidea/etcd,ylong/etcd,glevand/coreos--etcd,wantonsolutions/dinv-etcd,hongbinz/etcd,tangkun75/etcd,glycerine/etcd,asim/etcd,dnaeon/etcd,lorneli/etcd,dterei/etcd,gae123/etcd,jlamillan/etcd,mkumatag/etcd,betawaffle/etcd,endocode/etcd,mickep76/etcd,dnaeon/etcd,openedbox/etcd,siddontang/etcd,yichengq/etcd,visheshnp/etcd,coreos/etcd,bdarnell/etcd,spacejam/etcd,CrazyJvm/etcd,nieanan/etcd,purpleidea/etcd,lorneli/etcd,giantswarm/etcd,mgoelzer/etcd-fork2,chipironcin/etcd,raoofm/etcd,akauppi/etcd,Winslett/etcd,devfreesg/etcd,mischief/etcd,justintung/etcd,jravetch/etcd,mickep76/etcd,insionng/etcd,hzy001/etcd,hongbinz/etcd,qiaochao911/etcd,heyitsanthony/etcd,a-robinson/etcd,bakins/etcd,TheHippo/etcd,jeremyeder/etcd,kingland/etcd,luxas/etcd,gyuho/etcd,xebitstudios/etcd,jefby/etcd,mischief/etcd,linuxcer/etcd,zaphod-concur/etcd,wowsoso/etcd,hroyrh/etcd,mike-lerch/etcd,luxas/etcd,yichengq/etcd,gosharplite/etcd,HideoYamauchi/etcd,oscarrr110/etcd,lzbgt/etcd,yifan-gu/etcd,njucslqq/etcd,pengzj/etcd,njucslqq/etcd,ajityagaty/etcd,jefby/etcd,hongchaodeng/etcd,es-chow/etcd,betawaffle/etcd,hzy001/etcd,etcd-io/etcd,swingbach/etcd,insequent/etcd,qiaochao911/etcd,gosharplite/etcd,sayden/etcd,HideoYamauchi/etcd,onlyjob/etcd,gtank/etcd,mqliang/etcd,whuwxl/etcd,jonboulle/etcd,offscale/etcd,princeqjzh/etcd,delkyd/etcd,fanminshi/etcd,fgbreel/etcd,StorReduce/etcd,mike-lerch/etcd,yifan-gu/etcd,yudai/etcd,mwitkow-io/etcd,cognusion/etcd,ecnahc515/etcd,vimalk78/etcd,Winslett/etcd,lumjjb/etcd,rchicoli/etcd,shawnps/etcd,imzhulei/etcd,improbable-io/etcd,chenbaihu/etcd,snailwalker/etcd,ktateish/etcd,buaazp/etcd,combk8s/etcd,chai2010/etcd,beni55/etcd,xdlinear/etcd,ktateish/etcd,joshix/etcd,xychu/etcd,tempbottle/etcd,fanminshi/etcd,OyTao/etcd_learning,tangkun75/etcd,csuideal/etcd,axingblog/etcd,akauppi/etcd,offscale/etcd,combk8s/etcd,cockroachdb/etcd,cockroachdb/etcd,li-ang/etcd,achanda/etcd,kingland/etcd,swingbach/etcd,CrazyJvm/etcd,sebschrader/etcd,linuxcer/etcd,shakefu/etcd,onlyjob/etcd,tguangch/etcd,shafreeck/etcd,svdata/etcd,arthurcolle/etcd,freeloop1114/etcd,honeyqa/etcd,chai2010/etcd,honeyqa/etcd,glevand/coreos--etcd,nkhare/etcd,fasaxc/etcd,raoofm/etcd,openedbox/etcd,lzbgt/etcd,gityf/etcd,arthurcolle/etcd,achanda/etcd,Eagle-X/etcd,yyljlyy/etcd,dalanlan/etcd,robszumski/etcd,msanterre/etcd,elimisteve/etcd,princeqjzh/etcd,pauldallen/etcd,yyljlyy/etcd,iamqizhao/etcd,youxidev/etcd,ravigadde/etcd,robszumski/etcd,QuantiumTechnology/etcd,jravetch/etcd,beni55/etcd,shawnps/etcd,barakmich/etcd,xebitstudios/etcd,nekto0n/etcd,oscarrr110/etcd,xiang90/etcd,heyitsanthony/etcd,ecnahc515/etcd