Updated openstack/openstack
Project: openstack/neutron  db6dafcb29750bc7cbf0204543e2493c7fe0f81b
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Use an independent iptables lock per namespace

Since iptables is independent from namespace to namespace, it makes
sense to use an independent lock per namespace.  This improvement is
aimed at improving the parallel performance in the L3 agent.

Partially implements blueprint: neutron-tempest-parallel

Change-Id: I15e9c9da9a7c15981757a09bc744501722d62db2