auth: fix NoPassWord check when add user
auth: fix NoPassWord check when add user

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