Suppress a couple more DeprecationWarnings in the test suite.

Lib/test/test_urllibnet.py

@@ -91,7 +91,8 @@ class urlopenNetworkTests(unittest.TestCase):
         # test getcode() with the fancy opener to get 404 error codes
         URL = "http://www.example.com/XXXinvalidXXX"
         with support.transient_internet(URL):
-            open_url = urllib.request.FancyURLopener().open(URL)
+            with self.assertWarns(DeprecationWarning):
+                open_url = urllib.request.FancyURLopener().open(URL)
             try:
                 code = open_url.getcode()
             finally: