Brian Stengaard ce05ef7110 Add IAM role and Env credentials
This will make the s3 provider authentaction logic

  - Configured credentials if both key and secret available
  - Anonymous if key and secret missing and env_auth not set
  - if env_auth is set to truthy (https://golang.org/pkg/strconv/#ParseBool)
    - AWS_ACCESS_KEY_ID / AWS_SECRET_ACCESS_KEY environment variables
    - IAM role credentials as fallback
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