SDK Workspace.fromConfig() specify Tenant?

Can I specify `Tenant Id` in the `config.json` file?

When I have access to multiple tenants I receive multiple errors and then successful login in the end.

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* ID: 1d94ed89-5c02-627d-be4b-7be85ffeb876
* Version Independent ID: 581b19dc-544c-6a91-fa47-3d582f23a34b
* Content: [azureml.core.workspace.Workspace class - Azure Machine Learning Python](https://docs.microsoft.com/en-us/python/api/azureml-core/azureml.core.workspace.workspace?view=azure-ml-py)
* Content Source: [AzureML-Docset/stable/docs-ref-autogen/azureml-core/azureml.core.workspace.Workspace.yml](https://github.com/MicrosoftDocs/MachineLearning-Python-pr/blob/live/AzureML-Docset/stable/docs-ref-autogen/azureml-core/azureml.core.workspace.Workspace.yml)
* Service: **machine-learning**
* Sub-service: **core**
* GitHub Login: @DebFro
* Microsoft Alias: **debfro**

先從 issue 中連結的 Workspace.fromConfig() 參考和 AzureML-Core Workspace.yml 原始碼開始，然後檢查 config.json 如何處理 tenant 選取。確定是否支援 tenant ID，或是否需要新增它，並將完成定義為：已有文件說明的設定，或已確認 SDK 變更能夠避免所回報的 multi-tenant login errors。

由索引模型根據 Issue 內容生成。