AZURE_AUTHORITY_HOST does not allow URI scheme to be specified

[jongio]

In latest preview,

If I specify the AZURE_AUTHORITY_HOST environment variable with scheme (https)
AZURE_AUTHORITY_HOST=https://login.microsoftonline.us

I get the following exception:
DefaultAzureCredential failed to retrieve a token from the included credentials. Attempted credentials: EnvironmentCredential: <urllib3.connection.VerifiedHTTPSConnection object at 0x0000020F404EDCA0>: Failed to establish a new connection: [Errno 11001] getaddrinfo failed

It works if I do not provide a scheme
AZURE_AUTHORITY_HOST=login.microsoftonline.us

All other Azure SDK languages support specifying a URI scheme for AZURE_AUTHORITY_HOST.

Please update the Python implementation to allow the user to specify a scheme.

[jongio]

It would be great if this was implemented for the authorityHost property as well, because all the other langs allow it there as well.

[jongio]

FYI - I verified this with my manual tests against Azure Gov and it passed. Thank you for getting this in.

[chlowell]

Great, thanks for testing it.