Evaluate how kernel memory poisoning works for disk cache

See draft test procedure on #12354-note_13. Work shall be based on the wip/feature/12090-slab-poisoning branch.

Feature Branch: bugfix/12354-drop-kexec-memory-wipe

Original created by @intrigeri on 12398 (Redmine)

Edited Nov 22, 2019 by intrigeri

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information