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David Johnson authored
Several Neutron commits in response to bug 1557620 (https://bugs.launchpad.net/neutron/+bug/1557620, https://git.openstack.org/cgit/openstack/neutron/commit/?id=d761d26225a8fc63e512fc26b864a46c0956e19a) changed the way flow deletion handled the reserved_cookies set in br_cookie.py ; now there is actually a way to delete all flows. So, this patch continues to work with reserved_cookies, but adds preserved_cookies (hah) that even the generic uninstall_flows honors in the case of deleting all flows. We only patch the native OVS driver, not the ovs-vsctl driver; the latter will never be used again, I suspect.
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