keygeneration: Add a script to sanity check versions for a keyset
keygeneration: Add a script to sanity check versions for a keyset

Add a script that runs sanity checks on the versions in a keyset.
In particular, tests whether the actual key versions match those
in key.versions. Also runs consistency checks (for example: firmware
version should match kernel subkey version).

BUG=none
TEST=run on all of our keysets
BRANCH=none

Change-Id: I5b509ba33127364f6b63252ad167646eb7dce710
Reviewed-on: https://chromium-review.googlesource.com/190790
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>
Tested-by: Gaurav Shah <2987db6a10bcfe664554a372d01e80df7fd325a3@chromium.org>

geekboxzone/mmallow_external_vboot_reference,coreboot/vboot,geekboxzone/mmallow_external_vboot_reference,geekboxzone/mmallow_external_vboot_reference,geekboxzone/mmallow_external_vboot_reference,acorn-marvell/vboot_reference,coreboot/vboot,acorn-marvell/vboot_reference,coreboot/vboot,geekboxzone/mmallow_external_vboot_reference,acorn-marvell/vboot_reference,coreboot/vboot,coreboot/vboot,acorn-marvell/vboot_reference