Extend --trace or add a --debug flag to see server connections

[philpennock]

Proposed change

At present, if there is a cluster of hosts and the natscli connects but the TLS cert fails to verify, it appears that it will use the pre-TLS INFO line to look at alternative host IPs reported and try them in turn, until one connects.

But that happens without diagnostic feedback. Which is great for self-healing resiliency, but not for cluster administrators trying to carefully watch the rollout of a change.

Use case

If doing upgrades and trying to see TLS change impact, it's good to know which server is actually being talked to. Having --debug report connection attempts would make it clearer when silent reconnections are happening. Having a --no-reconnect might help too.

Contribution

Sure