- Added capability to read flow templates from files

- Added 'measured rate', which computes the flow programming rate as
  total_flows / total-elapsed-time from threads start to finish

- Small reorg of the code to get it ready for Floodlight flow config blaster

- README updates

- Helptext updates.

Change-Id: I1a286c790a05f4654f097b3d94f7f929c2ca1b8c
Signed-off-by: Jan Medved <jmedved@cisco.com>
Merge "- Added capability to read flow templates from files"