Comment 7 for bug 1696874

Reviewed: https://review.openstack.org/473305
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=3c0f4b7390e2204eaee9e821baa393a81095c4d5
Submitter: Jenkins
Branch: stable/newton

commit 3c0f4b7390e2204eaee9e821baa393a81095c4d5
Author: Kevin Benton <email address hidden>
Date: Thu Jun 8 16:10:45 2017 -0700

    Don't iterate updated_rule_sg_ids or updated_sg_members

    updated_rule_sg_ids and updated_sg_members can be updated
    concurrently by an RPC security_group_updated cast from the
    server which will result in a RuntimeError due to set
    size changing during iteration.

    This adjusts the logic to just iterate over a copy of the set.

    Change-Id: I0a7cf13157de256403cfd6196f64fafdfa65f180
    Closes-Bug: #1696874
    (cherry picked from commit e51ae07aecd14b8270f5e14175f943a5abc8caa6)