lib/packet/packet_base: fix signature of PacketBase.{parser, serialize}

All subclasses define them as
parser(cls, buf) and serialize(self, payload, prev)
Not parser(cls), serialize(self).

pylint also complains like
> W: 50,4:ipv4.parser: Arguments number differs from overridden method
> W: 65,4:ipv4.serialize: Arguments number differs from overridden method

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

1 files changed, 2 insertions, 2 deletions

diff --git a/ryu/lib/packet/packet_base.py b/ryu/lib/packet/packet_base.py
index 437678b3..aa38eb03 100644
--- a/ryu/lib/packet/packet_base.py
+++ b/ryu/lib/packet/packet_base.py
@@ -31,8 +31,8 @@ class PacketBase(object):
         self.protocol_name = self.__class__.__name__
 
     @classmethod
-    def parser(cls):
+    def parser(cls, buf):
         pass
 
-    def serialize(self):
+    def serialize(self, payload, prev):
         pass