Comment 7 for bug 1262566

Reviewed: https://review.openstack.org/92893
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=eb84cfb4ef7376401f48488d4810714c2664e5fa
Submitter: Jenkins
Branch: master

commit eb84cfb4ef7376401f48488d4810714c2664e5fa
Author: Aaron Rosen <email address hidden>
Date: Thu May 8 11:25:02 2014 -0700

    Fix security group race condition while listing and deleting rules

    Previously, there was a race condition that could occur if one was listing
    a security group which contained a rule which referenced another security
    group as an additional api call is used to look up the security group's
    name which is returned (rather than id) via the API. The problem occurs if
    this security group is deleted in which case a 404 was raised.
    This patch fixes this issue by catching the 404 and ignoring the rule as
    its already deleted as there is a constraint enforced that you cannot
    delete a security group if another security group has a rule that references
    that security group.

    Change-Id: I3855b8d3a1bd2f7c88901da071f9bd5581bd56e4
    Closes-bug: 1262566