Support dialing the same instance with and without IAM authn #731
Description
Feature Description
Presently, if a user dials an instance with IAM auth, the internal cache will use IAM auth for all subsequent certs. If a user then dials the same instance but without IAM auth, they'll get a cert with IAM auth enabled.
Instead, we should cache based on not just instance name (current behavior), but instance name + IAM auth being enabled.
Sample code
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Alternatives Considered
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Additional Details
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