Right now, we use a JSON object defined in AwsSellerAccountCredentials having fields

• accessKeyId
• secretAccessKeysellerAccount
• awsSellerAccountId

TODO

• Land an AWS config file that is equivalent to our AWS credentials JSON.
• Replace AwsCredentialsLookup w/ ProfileCredentialsProvider

More general documentation: https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_use.html

QE: actually better to test w/ SWATCH-813, as that'll land the credentials in stage & prod