[PATCH v6 0/3] rtcache removal respin

As before, this is just a respin of the routing cache removal patches
for people who want to play with this stuff.

The patch set has shrunk significantly, because several changes in the
previous series have been integrated to net-next-2.6

One new change is that now rt->rt_key_tos is removed alongside
rt->rt_key_{dst,src}

And finally, I've included an extra bonus patch showing an
experimental scheme I'm working on which will make output route
resolution in a routing-cache-less environment extremely fast.

Enjoy.