topology/dumper: fix RyuApp.__init__ signature

so that this is at least instantiatable.

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Acked-by: YAMADA Hideki <yamada.hideki@po.ntts.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ryu/topology/dumper.py

@@ -30,8 +30,8 @@ class DiscoveryEventDumper(app_manager.RyuApp):
     ''' This app dumps discovery events
     '''
 
-    def __init__(self):
-        super(DiscoveryEventDumper, self).__init__()
+    def __init__(self, *args, **kwargs):
+        super(DiscoveryEventDumper, self).__init__(*args, **kwargs)
 
         # For testing when sync and async request.
 #        self.threads.append(