DPDK: fix vRouter crash in from_vm_rx due to checksum offloading
DPDK: fix vRouter crash in from_vm_rx due to checksum offloading

Change-Id: Ibec34fdd4300eff54961dee6a1398d78678c915e
Closes-Bug: #1447587

codilime/contrail-vrouter,codilime/contrail-vrouter,codilime/contrail-vrouter,codilime/contrail-vrouter