Send out notification when instance updated

Registered by Zhenyu Zheng

Currently, users are allowed to update "name" and "description" using PUT /servers/server_uuid API, but no instance.update notification will be send,
"name" and "description" are obviously pretty useful when searching for
instances in searchlight. As searchlight depend on notifications to sync
data from Nova, we should add this.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Zhenyu Zheng
Direction:
Needs approval
Assignee:
Zhenyu Zheng
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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