Optimize SecurityGroupsOutputController

[Aaron Rosen]

When doing nova show currently SecurityGroupsOutputController calls out to quantum to list all the security groups and ports owned by a given tenant when we could directly query by device_id to find the security groups on an instance.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/30048

[Aaron Rosen (arosen)]

Hi, i think this should be backported to grizzly as "nova show instance" is having nova-api query all the ports for a given tenant rather than just the ones that match the instance id.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/30048
Committed: http://github.com/openstack/nova/commit/0604e77654d0c7eb5fda9600e9ca604da656d856
Submitter: Jenkins
Branch: master

commit 0604e77654d0c7eb5fda9600e9ca604da656d856
Author: Aaron Rosen <email address hidden>
Date: Tue May 21 21:18:29 2013 -0700

    Optimize SecurityGroupsOutputController by len(servers)

    The following patch adds an optimization for _extend_servers() so that
    it calls get_instance_security_groups() when len(servers) == 1, and
    get_instances_security_groups_bindings() when > 1. In addition, this patch
    adds a return statement if not len(servers) as there is no reason to
    perform a query if there are no servers.

    Fixes bug 1182730

    Change-Id: I149bf32176d60e72d76576168d15995f7215b657

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/grizzly
Review: https://review.openstack.org/35164