[EXTERNAL] [PATCH v2] app/test-crypto-perf: add shared session option

[Akhil Goyal]

> Add the option to create one session for the PMD, and share it across
> all of the queue pairs. This may help to discover/debug concurrency
> issues (both correctness and performance) that can occur when using this
> configuration.
> 
> Signed-off-by: Jack Bond-Preston <jack.bond-preston at foss.arm.com>
> Acked-by: Brian Dooley <brian.dooley at intel.com>
> Reviewed-by: Wathsala Vithanage <wathsala.vithanage at arm.com>
> Reviewed-by: Paul Szczepanek <paul.szczepanek at arm.com>
> ---
> v2:
>  * Added docs entry for the new option.
Rebased and applied to dpdk-next-crypto