Add support for ECS environments.
Add support for ECS environments.

If we are running in an ECS environment, we add the private IP of the
container host so that status checks made from the load balancer to the
private IP of the host can succeed.

Fixes KNOW-ME-API-2G

knowmetools/km-api,knowmetools/km-api,knowmetools/km-api,knowmetools/km-api