Python Support

When retreiving a list of PythonPackageContent from /content/python/packages/, the user should not be subjected to the full details of every content unit.

Which fields should we show? I propose

• filename
• name
• packagetype
• version

In addition to the fields

• _href
• created
• notes
• artifacts

Which get pulled in by the base Content serializer which we inherit from.

This looks like the following

{
    "_href": "http://localhost:8000/pulp/api/v3/content/python/packages/0d2f11f5-a8f6-44c9-9053-d1f3047adf3c/",
    "artifacts": {
        "shelf-reader-0.1.tar.gz": "http://localhost:8000/pulp/api/v3/artifacts/e6d61484-0d16-4296-9f80-5f6559dcbc2f/"
    },
    "created": "2018-04-27T21:27:06.925524Z",
    "filename": "shelf-reader-0.1.tar.gz",
    "name": "shelf-reader",
    "notes": {},
    "packagetype": "sdist",
    "type": "python",
    "version": "0.1"
}