* Initialize EC2ContainerServiceBackend and ContainerInstance objects with region_name
* Initialize ContainerInstance with default attributes
* These attributes are automatically applied by ECS when a container is registered
* Docs: http://docs.aws.amazon.com/AmazonECS/latest/developerguide/task-placement-constraints.html#attributes
* Format container_instance.attributes for response_object
* Python3
* Only use available ECS regions for ecs_backends
* Sort dictionaries on key='name' using lambda
* Sort all dicts in tests using lambda
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