Add a notification service as bridge between nova scheduler and nova compute

Registered by Guangya Liu (Jay Lau) on 2013-05-28

Now, if nova scheduler want to get latest VM status update, it need to query DB to get this, but this is not real time. It is better that we add a new notification service act as bridge between nova scheduler and nova compute.

nova-compute->nova notification->nova-scheduler.

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Needs approval
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Definition:
New
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If you are still working on this, please re-submit via nova-specs. If not, please mark as obsolete, and add a quick comment to describe why. --johnthetubaguy (20th April 2014)

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