flow_classify: remove table id parameter from API

flow_classify: remove table id parameter from API

This patch removes table id parameter from all the flow
classify apis to reduce the complexity alongwith some code
cleanup.

The validate api is exposed as public api to allow user
to validate the flow before adding it to the classifier.

Signed-off-by: Jasvinder Singh <jasvinder.singh@intel.com>
Acked-by: Bernard Iremonger <bernard.iremonger@intel.com>