add restore operation for cluster

Registered by yangyong on 2019-08-15

when a magnum cluster Upgrade /Resize action failed,the cluster status will be "UPDATE_FAILED" and users can not do a update actions any more. the update_failed status shoud not be the final status for a cluster and in most scenarios we still want to manage the cluster in the future. we know that repair a COE cluster from a failed status is complicated,but before we get a better auto-repair solution,we can manually check the cluster,make sure that it works properly,and offer a special use request to set the cluster status in a restore_complete status, the restore_complete is included in the allow_update_status and then we can redo Upgrade /Resize action in the environment.

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Drafter:
yangyong
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Needs approval
Assignee:
yangyong
Definition:
New
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