Fix buildbot failure in test_os.py

Lib/test/test_dl.py

@@ -3,7 +3,10 @@
    Roger E. Masse  revised strategy by Barry Warsaw
 """
 from test.test_support import verbose,TestSkipped, import_module
+import warnings
+warnings.simplefilter('always')
 dl = import_module('dl', deprecated=True)
+warnings.resetwarnings()
 
 sharedlibs = [
     ('/usr/lib/libc.so', 'getpid'),

Lib/test/test_os.py

@@ -500,8 +500,7 @@ class DevNullTests (unittest.TestCase):
 class URandomTests (unittest.TestCase):
     def test_urandom(self):
         try:
-            with test_support._check_py3k_warnings(
-                ('integer argument expected, got float', DeprecationWarning)):
+            with test_support.check_warnings():
                 self.assertEqual(len(os.urandom(1)), 1)
                 self.assertEqual(len(os.urandom(10)), 10)
                 self.assertEqual(len(os.urandom(100)), 100)