Change OVSSwitch.dpctl() to call ovs-ofctl

This should fix the problem of dump-flows not showing the OpenFlow
flow table flows and only showing cached kernel flow table flows.

fixes #136

mininet/cli.py

@@ -289,7 +289,7 @@ class CLI( Cmd ):
         self.inputFile = None
 
     def do_dpctl( self, line ):
-        "Run dpctl command on all switches."
+        "Run dpctl (or ovs-ofctl) command on all switches."
         args = line.split()
         if len(args) < 1:
             error( 'usage: dpctl command [arg1] [arg2] ...\n' )

mininet/node.py

@@ -924,8 +924,8 @@ class OVSSwitch( Switch ):
             exit( 1 )
 
     def dpctl( self, *args ):
-        "Run ovs-dpctl command"
-        return self.cmd( 'ovs-dpctl', args[ 0 ], self, *args[ 1: ] )
+        "Run ovs-ofctl command"
+        return self.cmd( 'ovs-ofctl', args[ 0 ], self, *args[ 1: ] )
 
     @staticmethod
     def TCReapply( intf ):