Fix a python (version 2.7.3) error

Signed-off-by: Yonghong Song <yhs@plumgrid.com>

tests/jit/test2.py

@@ -32,10 +32,11 @@ class TestBPFSocket(TestCase):
         key = Key(IPAddress("172.16.1.1").value, IPAddress("172.16.1.2").value)
         leaf = Leaf(IPAddress("192.168.1.1").value, IPAddress("192.168.1.2").value, 0)
         self.xlate.put(key, leaf)
-        with socket(AF_INET, SOCK_DGRAM) as udp:
-            udp.sendto(b"a" * 10, ("172.16.1.1", 5000))
+        udp = socket(AF_INET, SOCK_DGRAM)
+        udp.sendto(b"a" * 10, ("172.16.1.1", 5000))
         leaf = self.xlate.get(key)
         self.assertGreater(leaf.xlated_pkts, 0)
+        udp.close()
 
 if __name__ == "__main__":
     main()