{virtual-wan} Remove ADAL dependencies

[cxznmhdcxz]

Remove ADAL dependencies,
replace functions/models in msrestazure library with parity functions in azure.mgmt.core library or azure.core library

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[azure-client-tools-bot-prd]

️✔️Azure CLI Extensions Breaking Change Test

️✔️Non Breaking Changes

[azure-client-tools-bot-prd]

Hi @cxznmhdcxz,
Since the current milestone time is less than 7 days, this pr will be reviewed in the next milestone.

[yonzhan]

virtual-wan

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• For more info about extension versioning, please refer to Extension version schema

[jsntcy]

Could you explain why we replace assertRaisesRegexp with assertRaisesRegex?

[cxznmhdcxz]

Here's error of assertRaisesRegexp

         self.cmd('network vpn-server-config delete -n {vserverconfig} -g {rg} -y')
>       with self.assertRaisesRegexp(SystemExit, '3'):
E       AttributeError: 'AzureVWanVHubScenario' object has no attribute 'assertRaisesRegexp'. Did you mean: 'assertRaisesRegex'?

azure-cli-extensions\src\virtual-wan\azext_vwan\tests\latest\test_azure_vwan_vhub_commands.py:179: AttributeError

It's deprecated and renamed to assertRaisesRegex() for python3
https://docs.python.org/3/library/unittest.html#unittest.TestCase.assertRaisesRegex

[azclibot]

[Release] Update index.json for extension [ virtual-wan ] : https://dev.azure.com/azclitools/release/_build/results?buildId=186379&view=results