[PATCH] ipvs loopback connection

This is a port of Carlos Lozano's 2.4 patch[1] to 2.6.16.  I believe
Carlos's comments about the original 2.4 patch still pertain here:

	We have a machine that must be both a client and director. The
	two problems to solve are:
		* ipvs doesn't handle loopback packets
		* the return packets are handled by ip_vs_in, and not
		  by ip_vs_out.

With kernel 2.6 there's an additional problem to solve:
  * there's a shortcut used to recompute the tcp checksum that doesn't
    work in this case

The attached patch fixes the problems listed above.

1. http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.LVS-NAT.html#carlos_solution