[2.1] Incorrect API output when adding SSH keys via LP

[Andres Rodriguez]

roaksoax@unleashed:~/Desktop/project/maas$ maas admin sshkeys import protocol=lp auth_id=andreserl
Success.
Machine-readable output follows:
{
    "created": "2016-09-09T15:11:58.770",
    "protocol": "lp",
    "_state": "<django.db.models.base.ModelState object at 0x7f6bbf0be080>",
    "updated": "2016-09-09T15:11:58.770",
    "auto_update": false,
    "auth_id": "andreserl",
    "id": 1
}

Look at the "_state". What is this for?