sqs:
 image: s12v/elasticmq
 ports:
   - "9324:9324"
dynamodb:
  image: peopleperhour/dynamodb
  ports:
    - "45678:8000"
s3:
  image: scality/s3server:mem-latest
  ports:
    - "33333:8000"
sqs:
 image: s12v/elasticmq
 ports:
   - "9324:9324"
dynamodb:
  image: peopleperhour/dynamodb
  ports:
    - "45678:8000"
s3:
  image: scality/s3server:mem-latest
  ports:
    - "33333:8000"
sns:
  image: wellcome/fake-sns
  ports:
    - "9292:9292"

Add the SNS container to tests
Add the SNS container to tests

Not needed for message reading, really, but the PR to split reader/writer
config is in a different branch.
