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/command/upload.py b/Lib/distutils/command/upload.py
index ecc06f0..daf6811 100644
--- a/Lib/distutils/command/upload.py
+++ b/Lib/distutils/command/upload.py
@@ -10,7 +10,7 @@
 import os
 import socket
 import platform
-import configparser
+import ConfigParser
 import httplib
 import base64
 import urlparse