Revert distutils changes done in r63248.

As explained by Marc-Andre Lemburg, distutils needs to stay
backward-compatible. Therefore, it should use the old ConfigParser
module name.
diff --git a/Lib/distutils/config.py b/Lib/distutils/config.py
index e9ba402..cf54769 100644
--- a/Lib/distutils/config.py
+++ b/Lib/distutils/config.py
@@ -5,7 +5,7 @@
 """
 import os
 import sys
-from configparser import ConfigParser
+from ConfigParser import ConfigParser
 
 from distutils.core import Command