tap: set IFF_ONE_QUEUE per default
historically the kernel queues packets two times. once at the device and second in qdisc. this is believed to cause interface stalls if one of these queues overruns. setting IFF_ONE_QUEUE is the default in kernels >= 3.8. the flag is ignored since then. see kernel commit 5d097109257c03a71845729f8db6b5770c4bbedc Signed-off-by: NPeter Lieven <pl@kamp.de> Acked-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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