Multi-tenant authentication support in CLI

[andrew-slutsky]

Summary of the Pull Request

These are purposed changes to resolve ticket #344

I have tested these changes and it does not effect or break the current functionality.

I don't necessarily expect this PR to be merged without some tweaks. I'll coordinate over the next week or so to get it right.

One coding issue I would like to discuss/highlight is the assumption (in code) that if "--tenant_domain" is used then the 'common' authority is also used. I am open to suggestions.

PR Checklist

• Applies to work item: Multi-tenant authentication support in CLI #344
• CLA signed. If not, go over here and sign the CLI.
• Tests passed (with and without multitenant authentication)
• [?] Requires documentation to be updated
• [No] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: Multi-tenant authentication support in CLI #344

Info on Pull Request

Minor changes to the config file and the login process.

Validation Steps Performed

Tested these changes with a multi-tenant enabled endpoint and a single-tenant endpoint.

[andrew-slutsky]

Looks good!

[bmc-msft]

@anslutsk , there is an issue with Unicode. I made andrew-slutsky#2 to address this issue. If you merge that PR into your fork, this PR should be good to go.

[ghost]

Hello @bmc-msft!

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