Use lowercase environment value during searching#831
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Context: The "environment" field in the token cache contains an authority's domain name, which is stored as lowercase in cache. We did that right. But we noticed that when performing a search in the token cache, we were not converting the "environment" field to lowercase. This is usually not a problem, because the domain name is typically in lowercase. And no customer reported any issue. However, recently when we are running Managed Identity test cases on Windows, we found out that the domain name placeholder that we use, turns out to be mixed case on Windows, such as "CPC-raylu-UB85C". This would cause cache miss when running the Managed Identity client on a Windows machine.
This PR improves the token cache search/match logic to always search environment by lowercase.