Updated openstack/openstack
Project: openstack/neutron  21bc74d4773b5e01c24d54d7c42c74b79dc07192

Don't create unused ipset chain

when a security group don't have members, it should not create corresponding
ipset chain.

Change-Id: Ia04ffb3ac539c9a89a882e6dd91f373cb67c6f8b
Closes-bug: #1369431