fog/fog — pull request #1319 by mfine (2012-11-29 08:12:16+00:00)
Title: Expire sts token

Set `aws_credentials_expire_at` - either passed in option or from returned token.

DynamoDB access through Fog is not handling an expired session token. After 12 hours, we started receiving 400 status codes from the DynamoDB service. Have the `aws_credentials_expire_at` get set from either options or returned value from the token. I'm not sure that the returned value in `Expiration` will be compatible with the time check.