tools: rw-heatmaps output format bug fix
tools: rw-heatmaps output format bug fix

mkumatag/etcd,rnaveiras/etcd,coreos/etcd,mqliang/etcd,coreos/etcd,mkumatag/etcd,etcd-io/etcd,gyuho/etcd,mkumatag/etcd,ajityagaty/etcd,ajityagaty/etcd,mqliang/etcd,rnaveiras/etcd,mqliang/etcd,ajityagaty/etcd,gyuho/etcd,etcd-io/etcd,etcd-io/etcd,rnaveiras/etcd