on the `nsqlookupd` side, I don't feel like it's worth it to change the key that client libraries are already coded to look at (`address`) so what I think should happen is that instead of adding a new `broadcast_address` key, instead add the `hostname` key (populated by the appropriate value... old `nsqd` peers will populate both `address` and `hostname` with whatever they sent in their `IDENTIFY` commands `address` field... new `nsqd` peers have both fields)