tftest is incompatible with the terragrunt cli redesign

[mhulscher]

With the upcoming GA release of the terragrunt cli-redesign, tftest will fail to run terragrunt commands.

Most notably:

• run-all apply is being replaced with run --all -- apply
• -terragrunt-* params are replaced with newer variants

The old cli is still usable (although deprecated), while the new cli can already be used (or enforced with strict mode)

[ludoo]

Thanks for flagging this. Unfortunately I don't use Terragrunt, so unless someone sends a PR to fix its support, I will have to remove TG support from this library.

[mhulscher]

@ludoo if no-one else volunteers then I will make an attempt sometime soon :) I would prefer to keep terragrunt support in here.