examples/ioat: add new sample app for ioat driver

examples/ioat: add new sample app for ioat driver

A new sample app demonstrating use of driver for CBDMA.  The app receives
packets, performs software or hardware copy, changes packets' MAC addresses
(if enabled) and forwards them. The change covers ports initialization,
closing connection and argument parsing.

Signed-off-by: Pawel Modrak <pawelx.modrak@intel.com>
Signed-off-by: Marcin Baran <marcinx.baran@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>