salt-key does not ask for confirmation when running salt-key -D

Description of Issue

The salt-key binary is careful when deleting a single host key using salt-key -d . You have to confirm the removal of an accepted salt-client by typing Y/N
However when you accidentally type salt-key -D to delete a single key you will be surprised to immediately read the answer that all your keys were successfully deleted, without any Y/N request.
The user should be asked if he is sure to really delete all keys just like when salt-key -d is run.

Steps to Reproduce Issue

call salt-key -D and it will do what is documented but without any safety request similar to the behavior of salt-key -d

Versions Report

Salt: 3006.0

Start by locating the salt-key command entry point and reproduce the difference between salt-key -d and salt-key -D. Make the all-keys deletion path request Y/N confirmation, then verify that both accepting and declining the prompt behave safely; the issue names no specific file or test to run.