Hi Ferruh,

As I tested both with KNI sample app and KNI PMD, change looks good,
practically we can't change the scheduler delay with existing code but
this patch enables it and lets configure performance/CPU usage trade of.

Only possible change is to remove 'RTE_KNI_PREEMPT_DEFAULT' macro as
mentioned below.

Thanks for the suggestion.
I will send an updated version of the patch, which will remove the
RTE_KNI_PREEMPT_DEFAULT macro