child cell create instance error duo to wrong system_metadata format

[Yaguang Tang]

the instance primitive dict data constructed from API cell is send the child cell to create db entry ,
 but the instance['system_metadata'] dict is not contain only "key" "value" as keys , actually after converted by jsonutils.to_primitive the keys are all instance_system_metadata table columns , so in the child cell db entry can't be created successfully.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/34508

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/34508
Committed: http://github.com/openstack/nova/commit/ea6d089d196e2d71eac17a1b0079788a71522cfd
Submitter: Jenkins
Branch: master

commit ea6d089d196e2d71eac17a1b0079788a71522cfd
Author: Yaguang Tang <email address hidden>
Date: Wed Jun 26 15:11:54 2013 +0800

    Update instance properties values in child cells to create instance.

    When using nova cells, in child cell, instance properties dict received
    from API cell is returned by database that contains instance['name']. We
    need to pop this from dict before creating a instance entry in child cell.

    The system metadata also need to be recreated in child cell because instance
    properties dict is converted to primitive which makes instance['system_metadata']
    a list of dicts.

    Fix bug #1193552

    Change-Id: I43a8b4c1673a831b0c87881004eb0a7e5b149d9e

[Chris Behrens (cbehrens)]

There's also an issue with metadata:

https://bugs.launchpad.net/nova/+bug/1197166
https://review.openstack.org/35398