greentest/helper.py: try test.support if test_support is not available (py3k)....

greentest/helper.py: try test.support if test_support is not available (py3k). Patch by Damien Churchill.

greentest/helper.py

@@ -45,6 +45,9 @@ def prepare_stdlib_test(filename):
     import test
     try:
         from test import test_support
+    except ImportError:
+        try:
+            from test import support as test_support
         except ImportError:
             sys.stderr.write('test.__file__ = %s\n' % test.__file__)
             raise