Fix terraform outputs

[vinmazzi]

This pull request fixes an issue thread that is first described on #161.

Issue:
terraform -module option:
In order to get the authentication values returned by rancher, triton-kubernetes uses the old terraform output -module <module_name> option. Terraform has deprecated this option and is no longer saving modules output on it's tfstate.
In order to save the outputs back on the tfstate file I had to move it to the terraform module implementation, this way when terraform output is executed it returns all rancher outputs that are required by triton-kubernetes create cluster.

[vinmazzi]

This change is related to the issue #161.

[blackwood821]

@vinmazzi I ran into #161 when recently testing out triton-kubernetes. Despite the issue, I decided to test out https://github.com/joyent/docker-machine-driver-triton in Rancher. It didn't work out of the box but after debugging and some code modifications I got it working from within Rancher so now I can spin up Triton VMs as k8s nodes directly from the Rancher UI. It seems like this repository is a workaround for Rancher not knowing how to create Triton VMs. If this is something you or anyone else is interested in I can commit my changes to a fork.