If I start a replset without calling `rs.initiate` then the node driver gives me a server selection timeout error when using { useUnifiedTopology: true }.

Steps to start server:

rm -rf testdata0
mkdir -p testdata0/rs0-0 testdata0/rs0-1 testdata0/rs0-2
/opt/mongodb-osx-x86_64-enterprise-4.4.1/bin/mongod --port 27017 --dbpath=testdata0/rs0-0 --replSet=rs0
/opt/mongodb-osx-x86_64-enterprise-4.4.1/bin/mongod --port 27018 --dbpath=testdata0/rs0-1 --replSet=rs0
/opt/mongodb-osx-x86_64-enterprise-4.4.1/bin/mongod --port 27019 --dbpath=testdata0/rs0-2 --replSet=rs0

And for the driver: 

node --experimental-repl-await

const m = require('mongodb');

const c = await m.MongoClient.connect('mongodb://127.0.0.1:27017', { useUnifiedTopology: true })

> [MongoServerSelectionError: connect ECONNREFUSED 127.0.0.1:27017]

however if I run:
const m = require('mongodb'); const c = await m.MongoClient.connect('mongodb://127.0.0.1:27017')

or try to connect with the shell I get no errors.