Combine the functionality of test_support.run_unittest()
and test_support.run_classtests() into run_unittest()
and use it wherever possible.

Also don't use "from test.test_support import ...", but
"from test import test_support" in a few spots.

From SF patch #662807.
diff --git a/Lib/test/test_dummy_thread.py b/Lib/test/test_dummy_thread.py
index 7237670..0d614e1 100644
--- a/Lib/test/test_dummy_thread.py
+++ b/Lib/test/test_dummy_thread.py
@@ -162,11 +162,7 @@
     if test_support.verbose:
         print
         print "*** Using %s as _thread module ***" % _thread
-    suite = unittest.TestSuite()
-    suite.addTest(unittest.makeSuite(LockTests))
-    suite.addTest(unittest.makeSuite(MiscTests))
-    suite.addTest(unittest.makeSuite(ThreadTests))
-    test_support.run_suite(suite)
+    test_support.run_unittest(LockTests, MiscTests, ThreadTests)
 
 if __name__ == '__main__':
     test_main()