Better error messages when installing restricted packages using nuxeoctl.

I tried to install nuxeo-birt-integration using nuxeoctl in an unregistered instance of Nuxeo. The error message I got was, "Download failed for nuxeo-birt-integration-2.5.3. Package not found (404)."

Here's a larger chunk of the output:

Dependency resolution:
 Installation order (1):        nuxeo-birt-integration-2.5.3
 Unchanged packages (6):        nuxeo-dm:5.9.5, easyshare:1.0.2, nuxeo-agenda:1.1.4, nuxeo-drive:1.3.5, nuxeo-dam:5.9.5, nuxeo-social-collaboration:5.9.5
 Packages to download (1):      nuxeo-birt-integration:2.5.3

Do you want to continue (yes/no)? [yes] 
Downloading [nuxeo-birt-integration-2.5.3]...
Aborting packages change request

Some commands failed:
* download (nuxeo-birt-integration-2.5.3)
    Download failed for nuxeo-birt-integration-2.5.3. Package not found (404).

Nothing in the output implies that I need to register the instance, so the error was confusing to me (as a new user). The docs cover this vaguely (http://doc.nuxeo.com/x/FwNc).

It would be nice if the nuxeoctl error message simple informed me that the instance must be registered, though maybe the problem is that the marketplace should return a 401 and not a 404?

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nuxeoctl mp-add command provides a more comprehensive message when user try to install a Nuxeo package that requires to be registered.