Review naming convention in terraform

[cka-y]

Originally posted by @jcpitre in #801 (comment)

[jcpitre]

Some of the resources in terraform have a name in the resource line and another with in the resource (e.g. main.tf).
This is confusing, as evidenced by the #801 bug.

We should have a way to distinguish the name in the resource line, which AFAIK is only used within terraform, and the explicit name in the resource.
Maybe the terraform one should have a _tf suffix?