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/test/test_urllib2.py b/Lib/test/test_urllib2.py
index 8d17e05..1e93fdb 100644
--- a/Lib/test/test_urllib2.py
+++ b/Lib/test/test_urllib2.py
@@ -2,6 +2,7 @@
 from test import test_support
 
 import os
+import socket
 import StringIO
 
 import urllib2
@@ -551,14 +552,15 @@
 
         class NullFTPHandler(urllib2.FTPHandler):
             def __init__(self, data): self.data = data
-            def connect_ftp(self, user, passwd, host, port, dirs, timeout=None):
+            def connect_ftp(self, user, passwd, host, port, dirs,
+                            timeout=socket._GLOBAL_DEFAULT_TIMEOUT):
                 self.user, self.passwd = user, passwd
                 self.host, self.port = host, port
                 self.dirs = dirs
                 self.ftpwrapper = MockFTPWrapper(self.data)
                 return self.ftpwrapper
 
-        import ftplib, socket
+        import ftplib
         data = "rheum rhaponicum"
         h = NullFTPHandler(data)
         o = h.parent = MockOpener()
@@ -691,7 +693,7 @@
                 self.req_headers = []
                 self.data = None
                 self.raise_on_endheaders = False
-            def __call__(self, host, timeout=None):
+            def __call__(self, host, timeout=socket._GLOBAL_DEFAULT_TIMEOUT):
                 self.host = host
                 self.timeout = timeout
                 return self