Change to 12 nodes by default to match demo config. ;-)

examples/fakecluster.py

@@ -85,5 +85,5 @@ hosts = { 'mn': MininetServer }
 links = { 'mn': ServerLink }
 
 if __name__ == '__main__':
-    n = 8 if len( argv ) != 2 else int( argv[ 1 ] )
+    n = 12 if len( argv ) != 2 else int( argv[ 1 ] )
     test( n )