[PATCH] Remove SwapDir::reconfigure() arguments since they are not used.

Hi all.

This is a small cleanup patch discussed recently in another thread.
Note it depends on rock-reconfigure-t3.patch.

Before the change, SwapDir::reconfigure() took index and path
arguments. But none of them was actually used: neither index nor path
can be changed during reconfigure. And both index and path are
available as SwapDir members. So there is no reason to have these
arguments.

Regards,
  Dmitry