Fixed the semantic of timeout for socket.create_connection and
all the upper level libraries that use it, including urllib2.
Added and fixed some tests, and changed docs correspondingly.
Thanks to John J Lee for the patch and the pusing, :)
diff --git a/Lib/urllib2.py b/Lib/urllib2.py
index 546cea6..156c6f8 100644
--- a/Lib/urllib2.py
+++ b/Lib/urllib2.py
@@ -117,7 +117,7 @@
 __version__ = sys.version[:3]
 
 _opener = None
-def urlopen(url, data=None, timeout=None):
+def urlopen(url, data=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT):
     global _opener
     if _opener is None:
         _opener = build_opener()
@@ -359,7 +359,7 @@
             if result is not None:
                 return result
 
-    def open(self, fullurl, data=None, timeout=None):
+    def open(self, fullurl, data=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT):
         # accept a URL or a Request object
         if isinstance(fullurl, basestring):
             req = Request(fullurl, data)