Fixed iperf test.

Not sure if I want nox_core -v in nox.py - it's useful for debugging.
ripcordtest.py (and grid.py) still depend on routing, which I haven't been
able to test yet.

examples/ripcordtest.py

@@ -50,7 +50,7 @@ class FatTree( Network ):
          for neighbor in graph.neighbors( miniToGraph[ switch ] ):
             miniNeighbor = graphToMini[ neighbor ]
             if miniNeighbor not in currentNeighbors:
-               print ".", ; flush()
+               print '.', ; flush()
                createLink( switch, graphToMini[ neighbor ] )
       print
       return switches, hosts