Change some uses of cStringIO.StringIO to io.StringIO.
This is undoubtedly insufficient and in some cases just as broken as before.
diff --git a/Lib/httplib.py b/Lib/httplib.py
index 84401ac..4c23983 100644
--- a/Lib/httplib.py
+++ b/Lib/httplib.py
@@ -71,10 +71,7 @@
 import socket
 from urlparse import urlsplit
 
-try:
-    from cStringIO import StringIO
-except ImportError:
-    from StringIO import StringIO
+from io import StringIO
 
 __all__ = ["HTTP", "HTTPResponse", "HTTPConnection", "HTTPSConnection",
            "HTTPException", "NotConnected", "UnknownProtocol",