[spp] Update SPP for DPDK v17.11

[Yasufumi Ogawa]

Hi Ferruh,

Recently I found that make of SPP with DPDK v17.11 is failed because 
port_id is updated to uint16_t in this release. I think I have to update 
SPP to fix the problem.

First, I would like to send a patch of Makefile to show compatibility 
with DPDK v17.08 with current SPP, then start to create patches for 
updating SPP to v17.11.

Could you create a tag 'v17.08' after Makefile is updated? Or, I would 
like to do it if it is possible to make a change on SPP's repository.

Thanks,
Yasufumi

-- 
Yasufumi Ogawa
NTT Network Service Systems Labs