refactor: collect process status in parallel
refactor: collect process status in parallel

This speeds up ps:report for apps that have more than 1 running container.

progrium/dokku,dokku/dokku,claytonbrown/dokku,progrium/dokku,progrium/dokku,dokku/dokku,dokku/dokku,claytonbrown/dokku,claytonbrown/dokku,claytonbrown/dokku,dokku/dokku,claytonbrown/dokku,progrium/dokku,progrium/dokku,dokku/dokku,claytonbrown/dokku,claytonbrown/dokku,progrium/dokku,dokku/dokku,claytonbrown/dokku,progrium/dokku,progrium/dokku,dokku/dokku,dokku/dokku