Update skip message printed by test.support.get_attribute.

This helper was changed to work with any object instead of only modules
(or technically something with a __name__ attribute, see code in 3.2)
but the message stayed as is.
diff --git a/Lib/test/support.py b/Lib/test/support.py
index 619bf4c..556e82f 100644
--- a/Lib/test/support.py
+++ b/Lib/test/support.py
@@ -187,8 +187,7 @@
     try:
         attribute = getattr(obj, name)
     except AttributeError:
-        raise unittest.SkipTest("module %s has no attribute %s" % (
-            repr(obj), name))
+        raise unittest.SkipTest("object %r has no attribute %r" % (obj, name))
     else:
         return attribute