This extension adds image signing functionality to the "image create" command.
Therefore, new CLI options --sign-key-path and --sign-cert-id have been added.
This patch uses openstacksdk as the signing backend library instead of cursive.
Therefore, requirements and lower_constraints have been updated to use the
openstacksdk version 0.17 or higher.
Depends-On: Idc15b9a12d408bd4b2e096da8402c374be56f9fa
Change-Id: Ia20bc02a49c3fbeb9222e485e3396395f4ab817a
Story: 2002128
Co-Authored-By: Markus Hentsch <markus.hentsch@secustack.com>
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