Carlos Aguado e54f74776b Implement assume_role_with_web_identity
The AssumeRoleWithWebIdentity is a similar endpoint to STS's AssumeRole
where the authentication element is a JWT id_token from a configured OP.
This commit implements the functionality and relies on the same result
generated for the regular AssumeRole.
2019-07-16 13:27:47 +10:00
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