terraform/exec: Treat TempDir related vars as safe to pass through

[radeksimko]

Closes #77

[paultyng]

LGTM, are there others you should pass through, ie TF_VAR_* or something?

[radeksimko]

re TF_VAR_* - We can't really do anything useful with these variables yet (it's not relevant for version or providers schema).

More importantly though it is questionable whether the user can ensure that these ENV vars actually get propagated to the IDE in the first place and whether the IDE would pass them down to the server.

And even if they did, I have some doubts we'd interpret them the way user expects them to be interpreted - specifically because single IDE instance can serve many directories, each requiring different variables/context. So unless all of your variables apply to all projects you're working on, it would cause more confusion, because these variables will share the lifecycle of the IDE.

Terraform should however automatically load terraform.tfvars and we could also introduce a config option load_tfvars which would additionally attempt to load tfvars file of a given name in any directory or something like that.

[ghost]

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