Add instance group notification handler

Registered by Zhenyu Zheng

The notification handler for instance groups was missing when the server group plugin
added to Searchlight. Now the notifications can be send out by nova so let's add the
notification handler in SearchLight.

Blueprint information

Status:
Complete
Approver:
Travis Tripp
Priority:
High
Drafter:
Zhenyu Zheng
Direction:
Approved
Assignee:
Zhenyu Zheng
Definition:
Approved
Series goal:
Proposed for ocata
Implementation:
Implemented
Milestone target:
milestone icon ocata-3
Started by
Zhenyu Zheng
Completed by
Zhenyu Zheng

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