test_bgp: Enable to test parser with pcap file

Currently, test_bgp uses packet_data/bgp4/* files which contain only
BGP protocol binary data.
This patch convert packet_data file into pcap file and enable to test
BGP packet library with pcap file.
With pcap file, we can easily check packet data validity by using
Wireshark or other packet sniffer tools.

Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

ryu/tests/unit/packet/test_bgp.py

@@ -22,6 +22,7 @@ import unittest
 from nose.tools import eq_
 from nose.tools import ok_
 
+from ryu.lib.packet import packet
 from ryu.lib.packet import bgp
 from ryu.lib.packet import afi
 from ryu.lib.packet import safi
@@ -208,11 +209,10 @@ class Test_bgp(unittest.TestCase):
 
         for f in files:
             print('testing %s' % f)
-            binmsg = open(BGP4_PACKET_DATA_DIR + f, 'rb').read()
-            msg, rest = bgp.BGPMessage.parser(binmsg)
-            binmsg2 = msg.serialize()
-            eq_(binmsg, binmsg2)
-            eq_(rest, b'')
+            msg_buf = open(BGP4_PACKET_DATA_DIR + f + '.pcap', 'rb').read()
+            pkt = packet.Packet(msg_buf)
+            pkt.serialize()
+            eq_(msg_buf, pkt.data)
 
     def test_json1(self):
         opt_param = [bgp.BGPOptParamCapabilityUnknown(cap_code=200,