Introduces a new action type RTE_FLOW_ITEM_TYPE_MARK which enables
flow patterns to specify arbitrary integer values to match aginst
set by the RTE_FLOW_ACTION_TYPE_MARK action in previously matched
flows.
Add support for specification of new MARK flow item in testpmd's cli.
Update testpmd documentation to describe new MARK flow item support.
Signed-off-by: Declan Doherty <declan.doherty@intel.com>
e05419b3f0