Add net-alias

[scornelissen85]

This change will make it possible to ping other nodes on hostname. It used Docker DNS when start with Docker-compose. For example, when you start node1 and node2 you can do on node2:

ping node1

And it will succeed.

[justinpage]

I would love to see this. I'm taking a docker course that demonstrates this functionality as being present in a past build. Not sure why it no longer works? Was it removed?

Also, for those that are curious, you can actually ping the instance id as an alternative:

ping bee2ts8g_bee2ttggn5rg00b74htg

[scornelissen85]

@justinpage The option which add the host alias to containers is not merged yet. Yes, currently you can ping the instance_id.