No container status constant for 'Unknown'

[Ryan Rossiter]

It looks like when an exception gets raised when getting the containers, the API is setting the status of the container to be 'Unknown'. (see https://github.com/openstack/magnum/blob/master/magnum/api/controllers/v1/container.py#L294)

'Unknown' is not defined in https://github.com/openstack/magnum/blob/master/magnum/objects/container.py#L22-L26 as a possible status. This should be added to those constants and the API should be using the constant instead of the hard-coded string.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/218415
Committed: https://git.openstack.org/cgit/openstack/magnum/commit/?id=cac328d1c431f61bb81ea607d35859599b7ac6b5
Submitter: Jenkins
Branch: master

commit cac328d1c431f61bb81ea607d35859599b7ac6b5
Author: Ryan Rossiter <email address hidden>
Date: Fri Aug 28 18:39:19 2015 +0000

    Add UNKNOWN constant to container statuses

    The container API would set the status of a container to 'Unknown' if
    there was an exception when retrieving the container. This status should
    be contained as a constant (as with all other container constants). This
    change adds an UNKNOWN constant to the container object module, and
    changes the API to use that constant instead of the hard-coded string.

    Change-Id: I7cec02e2e8b8619bd2fcba4ba867ec8b21ad5afe
    Closes-Bug: #1489996