In case QoS is enabled for the gateway, we need to enable ovs_use_veth
to ensure that rate limiting will work inside of the namespace.
Change-Id: I1cbbcde27e4a9edac40ff0fe4086894c7b601087
(cherry picked from commit 5c58b66f543f66fe4c256a1e7f0fe5d54977539f)