revert 1003:714c59c30efe: socket.dup() is not supposed to inherit the timeout

gevent/socket.py

@@ -312,12 +312,13 @@ class socket(object):
     def dup(self):
         """dup() -> socket object
 
-        Return a new socket object connected to the same system resource."""
-        new_sock = socket(_sock=self._sock)
-        new_sock.timeout = self.timeout
-        return new_sock
+        Return a new socket object connected to the same system resource.
+        Note, that the new socket does not inherit the timeout."""
+        return socket(_sock=self._sock)
 
     def makefile(self, mode='r', bufsize=-1):
+        # note that this does not inherit timeout either (intentionally, because that's
+        # how the standard socket behaves)
         return _fileobject(self.dup(), mode, bufsize)
 
     def recv(self, *args):