[ECS] [request]: Support --uts docker run flag

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**Tell us about your request**
Support --uts docker run flag

**Which service(s) is this request for?**
This could be Fargate, ECS

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
Changing the docker host’s hostname from a container
https://docs.docker.com/engine/reference/run/#uts-settings---uts'

**Are you currently working around this issue?**
via ec2 userdata scripts

From https://github.com/aws/amazon-ecs-agent/issues/502

Start with Docker's documented --uts flag behavior and the ECS/Fargate scope named in the issue; then read the linked amazon-ecs-agent issue for context. Done means the relevant ECS service behavior and supported launch scope for --uts are defined and implemented.

Written by the indexing model from the issue text.