Add support for several ECS backends

[ghost]

Do you want to request a feature or report a bug?

Feature - I'd like traefik to support several ECS backends.

What did you do?

Hello. I wanted to add several EC2 clusters, because I use one cluster per application. I think it's rather typical usecase.

What did you see instead?

Traefik says that [ecs] section is allowed only once, so I cannot do that. Only way I see is to use one traefik per ECS backend, which isn't what I'd really want.

Output of traefik version: (What version of Traefik are you using?)

latest stable

[rockholla]

👍

[piteur]

Great idea, thanks ! :)