Story #9502: [EPIC] Contrainer Signing and Verification
As a user I, while mirroring, can verify image signature by providing verification policy config
Ticket moved to GitHub: "pulp/pulp_container/499":https://github.com/pulp/pulp_container/issues/499
Signatures are verified but not saved unless explicitly specified
signature-verify=True was specified, the image signature will be verified against provided verification policy.
Only images that pass signature verification will be saved.