R1:c6998207ab00

T5409, allow bin/remove to permanently destroy credential and everything associated with it

Summary: Fixes T5409, bin/remove permanently destroys credential

Test Plan: Add a passphrase, run bin/remove destroy K123 --trace, verify credential no longer exists

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T5409

Differential Revision: https://secure.phabricator.com/D10185