etcdserver: remove dup percentage sign in log
etcdserver: remove dup percentage sign in log

mkumatag/etcd,cockroachdb/etcd,dannysauer/etcd,gyuho/etcd,ajityagaty/etcd,li-ang/etcd,rnaveiras/etcd,ajityagaty/etcd,mkumatag/etcd,mqliang/etcd,rnaveiras/etcd,li-ang/etcd,coreos/etcd,gyuho/etcd,etcd-io/etcd,dannysauer/etcd,mqliang/etcd,mqliang/etcd,ajityagaty/etcd,coreos/etcd,mkumatag/etcd,etcd-io/etcd,cockroachdb/etcd,etcd-io/etcd,rnaveiras/etcd