[Cake] udp + ecn and udp flood tests

[Dave Taht]

To test how well the overload protection works, we need to drive things
to overload. The 50 flow test works pretty good that way...

but we could use to drive the ecn marking and non-ecn marking stuff
harder with isochronous udp, an udp + ECT(2) marked flows, to measure
what really happens.

the stuff in my isochronous repo could be retasked for this, as well as
iperf and/or d-itg

-- 
Dave Täht
Open Networking needs **Open Source Hardware**

https://plus.google.com/u/0/+EricRaymond/posts/JqxCe2pFr67