Add notifications when operating server groups

[Guangya Liu (Jay Lau)]

Currently, there is no notifications when operating server groups, such as create/delete/update etc. This caused 3rd party cannot know the operation result on time.

We should add notification for server group operations.

[Shunli Zhou (shunliz)]

Yes, we need these notficatins.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/107954

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/107954
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=daf278c0c8b6cc917b84f514fec65758adf17028
Submitter: Jenkins
Branch: master

commit daf278c0c8b6cc917b84f514fec65758adf17028
Author: Jay Lau <email address hidden>
Date: Thu Oct 16 15:08:32 2014 -0400

    Add notification for server group operations

    Currently, there is no notification when create/update/delete
    server groups, this caused some 3rd party client cannot know
    when those operations are finished.

    The fix was adding notifications for those operations.

    DocImpact
    The wiki page https://wiki.openstack.org/wiki/SystemUsageData
    needs to be updated once this patch was merged.

    Change-Id: Ia1f4a6752668ddb73ebb8faf525b58a28d183754
    Closes-Bug: #1343200

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/juno
Review: https://review.openstack.org/129355

[OpenStack Infra (hudson-openstack)]

Change abandoned by Matt Riedemann (<email address hidden>) on branch: stable/juno
Review: https://review.openstack.org/129355