(Merge 3.2) Issue #12133: fix a ResourceWarning in urllib.request

AbstractHTTPHandler.do_open() of urllib.request closes the HTTP connection if
its getresponse() method fails with a socket error. Patch written by Ezio
Melotti.

diff --cc Lib/test/test_urllib2.py
Simple merge

diff --cc Lib/urllib/request.py
Simple merge

diff --cc Misc/NEWS
index 38850c7a51f3387a1774896690263faf0c600730,6cc0f03637d8ca026c24f4b2fc55ce5efcd3ea1b..630b8905912e92eb17611f2af7ea29db92810972
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -193,9 -25,10 +193,13 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #12133: AbstractHTTPHandler.do_open() of urllib.request closes the HTTP
+   connection if its getresponse() method fails with a socket error. Patch
+   written by Ezio Melotti.
+ 
 +- Issue #12240: Allow multiple setup hooks in packaging's setup.cfg files.
 +  Original patch by Erik Bray.
 +
  - Issue #9284: Allow inspect.findsource() to find the source of doctest
    functions.