Refer to config directories using relative paths.
Refer to config directories using relative paths.

It turns out that hashicorp/terraform#25233 means that referring to
configuration files by absolute paths means that this library doesn't
work for Windows users using Terraform versions before 0.13.0-beta2. By
forcing relative paths, we can sidestep this bug, and make this work
across a wider range of Terraform versions on Windows.

hashicorp/terraform-plugin-test