raft: fix error message format in test
raft: fix error message format in test

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