provider/docker network alias

[jwayong]

This is addressing #10452 - basically an implementation where configuration can specify network_alias set of strings in a user-defined network. This is similar to --network-alias command from docker run.

For example you can do something like:

resource "docker_container" "web01" {
  image = "${docker_image.nginx.latest}"
  name  = "${var.environment}_web01"
  networks = ["${docker_network.private_network.name}"]
  network_alias = ["web01", "anotherweb01"]
}

And this will create Aliases of web01 and anotherweb01

[grubernaut]

LGTM, thanks!

[ghost]

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