nsqlookupd/nsqd: TLS on intra-cluster communication

According to this email conversation NSQ assumes that connections between nsqd and nsqlookupd is on a trusted network. Hence, TLS communication is only possible between clients and nsqd. I'm looking at use cases where nsqd and nsqlookupd would be located on geo-distributed systems where there isn't necessarily any "network security guarantees".

Proposal: Would you be interested in a pull request adding an option for TLS-wrapped communication between nslookupqd and nsqd?