packet lib: add unparsed data to Packet.protocols

Easy to access to the data that the library can't parse.

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

ryu/lib/packet/packet.py

@@ -35,6 +35,9 @@ class Packet(object):
                 self.parsed_bytes += proto.length
                 self.protocols.append(proto)
 
+        if len(self.data) > self.parsed_bytes:
+            self.protocols.append(self.data[self.parsed_bytes:])
+
     def serialize(self):
         self.data = bytearray()
         r = self.protocols[::-1]