Fix #576, add the code of igb_uio and enable_kmods.
Remove unnecessary files from DPDK.
DPDK: update to 18.11.5.
Reupgrade DPDK to 18.11.
Revert "DPDK:upgrade to 18.11.0 LTS."This reverts commit 8850115bd87ac2e168ca2ab33159528818d45fe8.
DPDK:upgrade to 18.11.0 LTS.