[Cake] triple flow isolation

[Jonathan Morton]

> On 16 Jan, 2016, at 11:05, Jonathan Morton <chromatix99 at gmail.com> wrote:
> 
> The opposite sense would be to have the side with the smaller number of hosts govern the system.  This would, I think, handle both the swarm and shard cases better than the above, so I’ll see if I can think of a way to adapt the algorithm to do that.

This turned out to be quite easy, going back to a slightly earlier (and happily simpler) version of the core algorithm.  I did say that the details of incrementing the per-host counters were the major source of subtleties.

https://github.com/dtaht/sch_cake/commit/2add740a79bb50b04e0497400a501df7b1857f48

 - Jonathan Morton