Parallel routing code patch #1 (preliminary)

[Matthew Dillon]

    Here is the first iteration of the parallel route table code.  This
    code was developed by Jeffrey Hsu and then further work was done on
    it by me:

	http://apollo.backplane.com/DFlyMisc/routing01.patch

    Currently the only known bug is that ARP over token-ring will not
    work properly.

    This patch needs basic testing.  Do 'route' commands work properly?
    Are there inconsistencies between cpus? (recognized by having weird
    TCP connection problems), etc etc.

    This is a very preliminary patch, 'alpha' quality at best.

						-Matt