Provide deployment manifest information via the CLI

We've gotten a user request for providing the contents of a deployment's MANIFEST.MF via the CLI.

The request is to include an option to get the manifest info for a single deployment, and also the info for all deployments.

This task needs to be evaluated in relationship to the larger request to provide read (and possibly in some cases write) access to all files within a deployment. The manifest is essentially just one file with a standard location.