Before this project, ./mongod would start a mongod listening on port 27017 by default. After this project, ./mongod will start a sharded cluster with an embedded router, which listens on its own port. We should make sure the default ports in the new configuration are reasonable. ie the embedded router should likely listen on 27017 by default, and the "shard" role on 27018 or 27019 depending on if it is a config shard or a regular shard.