Updated openstack/openstack
Project: openstack/nova  2efcc9dc242c913629ac8f11d9a5223159895f7b
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Add InstanceList.get_by_security_group()

This provides a way to get a list of instances that are in a given
security group. This alternative to SecurityGroup.instances is
much simpler and avoids the potential for passing around a
SecurityGroup object with a ton of Instance objects attached.

Related to blueprint compute-manager-objects

Change-Id: Iea282ea3559da00a03121d6eff59125a5fbae0b2