This script allows to create certificates (Root CA and Greengrass Core
device) and also register a GG Core device Thing.
It's expected to be used before building images with Greengrass core, so
the certificates and the proper configuration can be done in the
firmware.
https://jira.digi.com/browse/DEL-4274
Signed-off-by: Javier Viguera <javier.viguera@digi.com>
Javier Viguera