Container delete cli would have not good format exception message

[Kai Qiang Wu(Kennan)]

Right now, the container delete cli would have following message(when the id not exist)

ubuntu@magtest:/opt/stack/magnum$ magnum container-delete 1b558c54-a68f-4221-aa8a-23e3a00c5745
Delete for container 1b558c54-a68f-4221-aa8a-23e3a00c5745 failed: Container 1b558c54-a68f-4221-aa8a-23e3a00c5745 could not be found.
Traceback (most recent call last):

  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 142, in _dispatch_and_reply
    executor_callback))

  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 186, in _dispatch
    executor_callback)

  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
    result = func(ctxt, **new_args)

  File "/opt/stack/magnum/magnum/conductor/handlers/docker_conductor.py", line 112, in container_delete
    docker = self.get_docker_client(context, container_uuid)

  File "/opt/stack/magnum/magnum/conductor/handlers/docker_conductor.py", line 88, in get_docker_client
    container = objects.Container.get_by_uuid(context, container)

  File "/opt/stack/magnum/magnum/objects/base.py", line 109, in wrapper
    result = fn(cls, context, *args, **kwargs)

  File "/opt/stack/magnum/magnum/objects/container.py", line 72, in get_by_uuid
    db_container = cls.dbapi.get_container_by_uuid(context, uuid)

  File "/opt/stack/magnum/magnum/db/sqlalchemy/api.py", line 457, in get_container_by_uuid
    raise exception.ContainerNotFound(container=container_uuid)

ContainerNotFound: Container 1b558c54-a68f-4221-aa8a-23e3a00c5745 could not be found.
 (HTTP 404)

Usually we need like this
ubuntu@magtest:/opt/stack/magnum$ magnum container-delete 1b558c54-a68f-4221-aa8a-23e3a00c5745
Delete for container 1b558c54-a68f-4221-aa8a-23e3a00c5745 failed: Container 1b558c54-a68f-4221-aa8a-23e3a00c5745 could not be found.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/181825

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/181825
Committed: https://git.openstack.org/cgit/openstack/magnum/commit/?id=8b6893e7fbdeb799f025f95b9dff55ed8265e17a
Submitter: Jenkins
Branch: master

commit 8b6893e7fbdeb799f025f95b9dff55ed8265e17a
Author: HackToday <email address hidden>
Date: Mon May 11 16:33:29 2015 +0800

    Fix the container delete uuid issue

    Query db first to make sure container exist or not, and then
    call remote api for container

    Closes-Bug: #1453709
    Change-Id: Ib74120a5d7f560e878b7dd26183173679c6cc75c