Revert "Removing unnecessary outpipe values that had been used for reconnecting existing pipes - no longer needed when using a pipe term for the delay_attach situation."

This reverts commit ace7c99b91.

src/session_base.hpp

@@ -104,6 +104,9 @@ namespace zmq
         //  Pipe connecting the session to its socket.
         zmq::pipe_t *pipe;
 
+        //  Socket end of pipe, in case of reconnection
+        zmq::pipe_t *outpipe; 
+
         //  This flag is true if the remainder of the message being processed
         //  is still in the in pipe.
         bool incomplete_in;