'net' README

I intend to shortly submit what I hope is the final set of networking
fixes to Linus for 3.13

Please give extra consideration to any bug fixes you might be thinking
about sending from this point forward.

Is it REALLY necessary?  Does it impact significantly a large group of
users?

If you can't answer yes to those two questions, at a minimum, just
target it to net-next.

Thanks.