Allow a user to validate sstate objects against a list of keys, instead
of just any known key in the user's keychain.
(From OE-Core rev: 52ba0c5e6e2e3d5d01dc3f01404f0ab1bb29b3b5)
Signed-off-by: Daniel McGregor <daniel.mcgregor@vecima.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>