Add support for target tracking for container service autoscaling

[gustavosoares]

On Feb 9, AWS added the ability to set up service autoscaling using target tracking policies for containerized services. (https://aws.amazon.com/about-aws/whats-new/2018/02/target-tracking-available-for-container-service-auto-scaling-in-amazon-ecs-console/). Any plans to have this available through terraform?

[ghost]

This issue has been automatically migrated to hashicorp/terraform-provider-aws#3461 because it looks like an issue with that provider. If you believe this is not an issue with the provider, please reply to hashicorp/terraform-provider-aws#3461.

[ghost]

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