Add support to use vswitch to handle V2V in PVVP SRIOV scenario

Add support to use vswitch to handle V2V in PVVP SRIOV scenario

1. Add support to use vswitch to handle V2V in PVVP SRIOV scenario
2. Update nfvbenchvm to 0.5:
    (1) Update VPP to 17.10;
    (2) Update DPDK testpmd to 17.08;
    (3) Change kernel to based on longterm lineup;

Change-Id: I944489579a4cd92d17075e80870bbdb32512a150
Signed-off-by: Yichen Wang <yicwang@cisco.com>