raft: fix test case for #7042
raft: fix test case for #7042

mkumatag/etcd,plasticbox/etcd,jlamillan/etcd,tguangch/etcd,akauppi/etcd,ravigadde/etcd,li-ang/etcd,insequent/etcd,heyitsanthony/etcd,li-ang/etcd,coreos/etcd,handsomesun/etcd,glevand/coreos--etcd,bluebreezecf/etcd,lorneli/etcd,jlamillan/etcd,etcd-io/etcd,mqliang/etcd,whuwxl/etcd,mkumatag/etcd,insequent/etcd,vimalk78/etcd,handsomesun/etcd,gyuho/etcd,etcd-io/etcd,xiang90/etcd,dannysauer/etcd,heyitsanthony/etcd,mqliang/etcd,mqliang/etcd,sinsharat/etcd,sebrandon1/etcd,joshix/etcd,a-robinson/etcd,akauppi/etcd,rnaveiras/etcd,ajityagaty/etcd,bdarnell/etcd,fanminshi/etcd,etcd-io/etcd,mickep76/etcd,dannysauer/etcd,CrazyJvm/etcd,ajityagaty/etcd,lumjjb/etcd,armstrongli/etcd,yudai/etcd,rnaveiras/etcd,whuwxl/etcd,xiang90/etcd,ajityagaty/etcd,YuleiXiao/etcd,armstrongli/etcd,tguangch/etcd,plasticbox/etcd,a-robinson/etcd,mkumatag/etcd,fanminshi/etcd,rnaveiras/etcd,cockroachdb/etcd,YuleiXiao/etcd,joshix/etcd,visheshnp/etcd,CrazyJvm/etcd,mickep76/etcd,ravigadde/etcd,cockroachdb/etcd,visheshnp/etcd,lorneli/etcd,vimalk78/etcd,sinsharat/etcd,lumjjb/etcd,coreos/etcd,yudai/etcd,sebrandon1/etcd,bluebreezecf/etcd,gyuho/etcd,bdarnell/etcd,glevand/coreos--etcd