[EXT] [dpdk-dev v1 1/2] app/test: add diffie-hellman test cases

[Akhil Goyal]

> From: Arkadiusz Kusztal <arkadiuszx.kusztal at intel.com>
> 
> Added Diffie-Hellman tests. This tests adding possibility
> to check correctness of particular DH phases, which is not
> possible with current tests cases.
> 
> Signed-off-by: Arkadiusz Kusztal <arkadiuszx.kusztal at intel.com>
> Signed-off-by: Kai Ji <kai.ji at intel.com>
This series will be deferred for next release as it is sent pretty late for this cycle.