Fixed nox_pysw not to fail on startup, but --port still doesn't work.

mininet/node.py

@@ -683,7 +683,7 @@ def __init__( self, name, noxArgs=None, **kwargs ):
 
         Controller.__init__( self, name,
             command=noxCoreDir + '/nox_core',
-            cargs='--libdir=/usr/local/lib -v -i ptcp:%s ' % self.port +
+            cargs='--libdir=/usr/local/lib -v -i ptcp:%s ' +
                     ' '.join( noxArgs ),
             cdir=noxCoreDir, **kwargs )