Cloud shell "az datamodel create" issue

### **This is autogenerated. Please review and update as needed.**

## Describe the bug
Creating datamodel from Cloud Shell (bash)

**Command Name**
`az datamodel create
Extension Name: aidls. Version: 0.1.20201025.572.`

**Errors:**
```
'Response' object has no attribute 'status'
Traceback (most recent call last):
azure/cli/core/adal_authentication.py, ln 103, in set_token
super(MSIAuthenticationWrapper, self).set_token()
python3.6/site-packages/msrestazure/azure_active_directory.py, ln 598, in set_token
self.scheme, _, self.token = get_msi_token(self.resource, self.port, self.msi_conf)
python3.6/site-packages/msrestazure/azure_active_directory.py, ln 486, in get_msi_token
result.raise_for_status()
...

azure/cli/core/adal_authentication.py, ln 114, in set_token
.format(err.response.status, err.response.reason))
AttributeError: 'Response' object has no attribute 'status'
```

## To Reproduce:
Steps to reproduce the behavior. Note that argument values have been redacted, as they may contain sensitive information.

- `az datamodel create --name {} --model-directives {} -g {} --synapse-workspace {}`

## Expected Behavior
datamodel is created

## Environment Summary
```
Linux-4.15.0-1098-azure-x86_64-with-debian-stretch-sid (Cloud Shell)
Python 3.6.10
Installer: DEB

azure-cli 2.14.0 *

Extensions:
aidls 0.1.20201025.572
ai-examples 0.2.4

```
## Additional Context

Start by reproducing `az datamodel create` in the Cloud Shell environment described, then read `azure/cli/core/adal_authentication.py` around `set_token` and the traceback path in `msrestazure/azure_active_directory.py`. Determine why the MSI authentication error exposes no `status`, and confirm that the command creates the datamodel without the reported AttributeError.

Written by the indexing model from the issue text.