tc: introduce Flower classifier

This patch introduces a flow-based filter. So far, the very essential
packet fields are supported.

This patch is only the first step. There is a lot of potential performance
improvements possible to implement. Also a lot of features are missing
now. They will be addressed in follow-up patches.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc include/uapi/linux/pkt_cls.h
Simple merge

diff --cc net/sched/Kconfig
Simple merge

diff --cc net/sched/Makefile
Simple merge

diff --cc net/sched/cls_flower.c
Simple merge