Silence altered execution state warnings from test_telnetlib involving threads.
diff --git a/Lib/test/test_telnetlib.py b/Lib/test/test_telnetlib.py
index a78b938..efd91c7 100644
--- a/Lib/test/test_telnetlib.py
+++ b/Lib/test/test_telnetlib.py
@@ -39,6 +39,7 @@
     def tearDown(self):
         self.evt.wait()
         self.thread.join()
+        del self.thread  # Clear out any dangling Thread objects.
 
     def testBasic(self):
         # connects