[Cake] Possible conntrack lookup improvements

[Jonathan Morton]

> On 3 May, 2019, at 4:55 pm, Kevin Darbyshire-Bryant <kevin at darbyshire-bryant.me.uk> wrote:
> 
> Two patches attached - one is a simple variable elimination with no functional change.  The second changes/simplifies the conntrack tuple lookup & usage.  I’ve had a play and I don’t think I’ve broken any of the host fairness BUT it could do with some more testing, that’s where you come in… 

Looks like sound logic, as long as it does actually work.  It could be a useful speedup for those small CPE devices which need NAT and host-fairness working.

 - Jonathan Morton