Support Terraform 0.14.0 and later -chdir Global Option

[bflad]

Reference: https://github.com/hashicorp/terraform/blob/v0.14/CHANGELOG.md
Reference: hashicorp/terraform#26087
Reference: hashicorp/terraform#25558
Reference: hashicorp/terraform#18030

Terraform commands have historical incompatibilities when executed outside the configuration directory, for example automatic variables files are not properly read. Terraform 0.14.0 (all pre-release versions) introduces a new -chdir global option, e.g. terraform -chdir /path/to/config <command> syntax. Later Terraform versions will deprecate the older terraform <command> /path/to/config as an argument.

[bflad]

Took a swing at this here: #100

[bflad]

Please note that this will now be required in upcoming Terraform CLI versions: hashicorp/terraform#27664

[magodo]

Is there any update on this issue?