Prototype of PartitionSort integration

[Nic30]

PartitionSort classification alg. which uses hypersplit like decision trees, does support fast updates and as it is tree based it has significantly better memory complexity.

https://github.com/sorrachai/PartitonSort/tree/master/PartitionSort

(There is also pull request which integrates the PartitionSort in to some other virtual switch, but I do not know the name, I did added the comment in that pull request, but still can find it, maybe it was rejected and deleted.)

[Nic30]

lagopus/lagopus#132