Comment 2 for bug 1514056

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Jian Wen (wenjianhn) wrote : Re: Set agent timestamp aka cookie to physical bridges

After restarting an ovs agent, it still drops all existing flows of the physical bridges.
We need the timestamps to clean stale flows. Related to bug 1383674

Feel free to use my patch:
https://github.com/wenjianhn/neutron/tree/draft-graceful-restart-br-physical