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/Doc/library/socket.rst b/Doc/library/socket.rst
index e5a8167..16feee5 100644
--- a/Doc/library/socket.rst
+++ b/Doc/library/socket.rst
@@ -207,12 +207,11 @@
 
 .. function:: create_connection(address[, timeout])
 
-   Connects to the *address* received (as usual, a ``(host, port)`` pair), with an
-   optional timeout for the connection.  Especially useful for higher-level
-   protocols, it is not normally used directly from application-level code.
-   Passing the optional *timeout* parameter will set the timeout on the socket
-   instance (if it is not given or ``None``, the global default timeout setting is
-   used).
+   Convenience function.  Connect to *address* (a 2-tuple ``(host, port)``),
+   and return the socket object.  Passing the optional *timeout* parameter will
+   set the timeout on the socket instance before attempting to connect.  If no
+   *timeout* is supplied, the global default timeout setting returned by
+   :func:`getdefaulttimeout` is used.
 
    .. versionadded:: 2.6