Apply Drush changes to drd_pi

Here's a patch for it.

Thanks @szeidler, just reviewed and merged your patch. BTW, with issue forks and an MR it is much easier for maintainers to do all that. So, I'd appreciate your contribution and want to encourage you to use those new methods in the future. They will become the only viable option soon anyways.

Automatically closed - issue fixed for 2 weeks with no activity.