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After copyto is called, make the new fhandler's pipe_name point to the new fhandler's pipe_name_buf, which is a *copy* of the old fhandler's pipe_name_buf. Previously, get_pipe_name would return the wrong result after a clone/dup, causing create_pipe_instance and open_pipe to fail. Also, stop the listen_client thread when cloning. Otherwise the thread can keep accepting connections that the cloned fhandler won't know about. Do this via a new method fhandler_fifo::stop_listen_client, extracted from fhandler_fifo::close.
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