wangxiyuan f9a4ee90b7 Support metadata for backup resource
Now only volume and snapshot has metadata property.
We should support it for backup as well.

This patch added/updated the related db and ovo model,
updated the related backup CRUD APIs.

Change-Id: I6c4c175ec3be9423cdc821ccb52578dcfe442cbe
Implements: blueprint metadata-for-backup
2017-07-26 14:23:58 +08:00
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