feat: Implement autoupdate endpoint in libpod REST API

[StefanNienhuis]

This PR implements a new libpod REST API endpoint providing the autoupdate functionality, as it is included in the podman CLI. It accepts the same options as the CLI version. The end goal of this is to allow applications, such as cockpit-podman, to perform container updates in a similar manner to what is possible with the CLI.

This PR also modifies the swagger-check script. Since the endpoint is /libpod/autoupdate, the linter expected the response to be named autoupdateListResponse. The name autoupdateResponse made more sense in my mind so I added an exception for this in the swagger-check script. If this is not intended, I can remove it and use the suggested name instead.

Does this PR introduce a user-facing change?

Added auto update endpoint to the REST API

[openshift-ci]

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[StefanNienhuis]

Regarding tests, this will require running a container from a systemd unit and performing tests on the api. Is this currently supported in the test system, and if so, can someone with more knowledge of the project point me in the right direction?