openvswitch: Restructure datapath.c and flow.c

Over the time datapath.c and flow.c has became pretty large files.
Following patch restructures functionality of component into three
different components:

flow.c: contains flow extract.
flow_netlink.c: netlink flow api.
flow_table.c: flow table api.

This patch restructures code without changing logic.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>

diff --cc net/openvswitch/Makefile
Simple merge

diff --cc net/openvswitch/datapath.c
Simple merge

diff --cc net/openvswitch/datapath.h
Simple merge

diff --cc net/openvswitch/flow.c
Simple merge

diff --cc net/openvswitch/flow.h
Simple merge

diff --cc net/openvswitch/flow_netlink.c
Simple merge

diff --cc net/openvswitch/flow_netlink.h
Simple merge

diff --cc net/openvswitch/flow_table.c
Simple merge

diff --cc net/openvswitch/flow_table.h
Simple merge