Adding container name to error message along with internal port, help…

[saavkaar]

Adding container name to error message along with internal port, helpful when you have multiple containers with service running on same internal port.

[palantirtech]

Thanks for your interest in palantir/docker-compose-rule, @saavkaar! Before we can accept your pull request, you need to sign our contributor license agreement - just visit https://cla.palantir.com/ and follow the instructions. Once you sign, I'll automatically update this pull request.