[spp] Patches for spp_vf on DPDK17.11

[x-fn-spp at sl.ntt-tx.co.jp]

Hi everyone,

Last year, we've sent some patches for spp_vf on DPDK17.08.
In addition to these patches, we are now ready to contribute
the patches for spp_vf on DPDK17.11.

Code changes will be posted in the following emails.