Allow Passing AWS Session Token

[midnightconman]

At the moment we don't allow passing in an aws session token for the s3 provider... temporary tokens require that the session token also be provided with the access and secret keys. Without this change we don't allow temporary s3 tokens (tokens that start with ASIA instead of AKIA.

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[droslean]

/ok-to-test

[midnightconman]

@droslean can you please take another look?

[droslean]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: droslean, midnightconman

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