Silent hanging if Azure CLI command requires interactivity

When running the tool as `sudo`. I noticed that it would just hang at "Creating 2 devices in hub jlian-sandbox". Finally figured out after when I ran `sudo az iot hub device-identity create` directly and it asked me if I wanted to install `azure-iot` extension [Y/n]. Once installed the tool no longer hangs.

Strangely I can't repro this anymore.

I think we should either make `azure-iot` extension a prerequisite in the docs or expose the interactivity through the tool.

Start by reproducing the tool under sudo while running `az iot hub device-identity create`, especially when the azure-iot extension is not installed. The issue does not identify files or tests; done means avoiding a silent hang by documenting the extension prerequisite or exposing the command's interactivity.

Written by the indexing model from the issue text.