document verify-traffic and verify-network

[dovholuknf]

Networking is hard and understanding how OpenZiti advertisements work is a common stumbling block. verify-network and verify-traffic help to diagnose problems, but they are still hidden. Add some troubleshooting doc so we can just point forum users at it so they can find/run these tools when they are setting up their overlay.

Produce a walkthrough video (or series) on usage as well and incorproate into the doc