Only use 80 hosts for linearbandwidth.py for now

In the long run, we should debug the performance issues
with kvm and Ubuntu 15. For now, however, we're relaxing
the constraints.

Closes #594

examples/linearbandwidth.py

@@ -121,6 +121,6 @@ def linearBandwidthTest( lengths ):
 
 if __name__ == '__main__':
     lg.setLogLevel( 'info' )
-    sizes = [ 1, 10, 20, 40, 60, 80, 100 ]
+    sizes = [ 1, 10, 20, 40, 60, 80 ]
     print "*** Running linearBandwidthTest", sizes
     linearBandwidthTest( sizes  )