TKNECO-85: Catalog Contract and Subcommands

[otaviof]

The first changes described here for the catalog contract, and the following subcommands:

• release
• sign
• verify

[openshift-ci-robot]

@otaviof: This pull request references TKNECO-85 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.15.0" version, but no target version was set.

In response to this:

The first changes described here for the catalog contract, and the following subcommands:

• release
• sign
• verify

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[otaviof]

/retest

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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