Support ServicePrinciple with Token to create Redis ConnectionMultiplexer

[AdamWuGitHub]

In Private review, Azure Redis support service principal with AccessToken, can we keep support that in the new lib?

ConfigurationOptions options = ConfigurationOptions.Parse($"{HostName}:6380,user={ServicePrincipalName},password={result.AccessToken}");

[samsaha-ms]

From public preview onwards server-side authentication check is hardened. Additionally multiple SPN can share the same name. Based on these factors and feedback from private preview customers we have removed the support for SPN name as username from server side itself. Hence for this client library it is irrelevant now to support the SPN name as user.

[AdamWuGitHub]

Can we support using certificate to authorize AAD?

[samsaha-ms]

I believe active work is ongoing to support certificate based auth using SPN.
@philon-msft, do you want to take this question?

[philon-msft]

v2.0.0 supports authentication using a Service Principal certificate. Please let us know if you see any issues.