selftests: add dm-verity keyring selftests

Add selftests that verify the keyring behaves correctly.
For simplicity this works with dm-verity as a module.

Signed-off-by: Christian Brauner <brauner@k

selftests: add dm-verity keyring selftests

Add selftests that verify the keyring behaves correctly.
For simplicity this works with dm-verity as a module.

Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

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