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_string.py b/Lib/test/test_string.py
index 918207a..859dd4e 100644
--- a/Lib/test/test_string.py
+++ b/Lib/test/test_string.py
@@ -95,10 +95,7 @@
         self.assertEqual(string.capwords('ABC-def DEF-ghi GHI'), 'Abc-def Def-ghi Ghi')
 
 def test_main():
-    suite = unittest.TestSuite()
-    suite.addTest(unittest.makeSuite(StringTest))
-    suite.addTest(unittest.makeSuite(ModuleTest))
-    test_support.run_suite(suite)
+    test_support.run_unittest(StringTest, ModuleTest)
 
 if __name__ == "__main__":
     test_main()