change flag from RDONLY to RDWR and close the fifo correct

Signed-off-by: Zhiyu Li <payall4u@qq.com>

runtime/v2/binary.go

@@ -115,6 +115,7 @@ func (b *binary) Start(ctx context.Context, opts *types.Any, onClose func()) (_
 	onCloseWithShimLog := func() {
 		onClose()
 		cancelShimLog()
+		f.Close()
 	}
 	client := ttrpc.NewClient(conn, ttrpc.WithOnClose(onCloseWithShimLog))
 	return &shim{