Add support to MSAL package

[kfirberger]

Add support to MSAL package

We want to upgrade from ADAL to MSAL, we don't use ADAL directly in our code, but we do initialize SecretClient object from azure.keyvault.secrets package. It turns out that even the latest version of azure.keyvault.secrets uses ADAL through using another package msrestazure.

Can you add support to MSAL packages or/and make sure that ADAL won't be included even as external dependency?

Example: File "...", line 6, in from azure.keyvault.secrets import SecretClient File "....venv\lib\site-packages\azure\keyvault_init.py", line 25, in from .key_vault_client import KeyVaultClient File "....venv\lib\site-packages\azure\keyvault\key_vault_client.py", line 14, in from msrestazure.azure_active_directory import BasicTokenAuthentication File "....venv\lib\site-packages\msrestazure\azure_active_directory.py", line 38, in import adal_