Add message listing orphaned resources on successful Droplet destroy

[ajmorozoff]

Following successful destruction of a droplet(s), an additional message should display that informs the user of any resources that were attached, and are now unassigned. This includes: -Snapshots -Volumes -Domains -FLIPs

[hilary]

This feature is under development, stay tuned 😄

[andrewsomething]

With the new endpoints for destroying and listing associated resources, this is now more feasible:

https://developers.digitalocean.com/documentation/changelog/api-v2/destroy-a-droplet-with-associated-resources/