Added contrail vrouter

Pending inline documentation
Pending Spec tests

Note: This is WIP
This is the code I just taken from contrail.

Basically they are configuring network RPS (receive packet steering) which enable directing packets which received on specific interface to specific cpu(s). Usually this does as a performance improvement, but I see they just use cpu0 for pkt0 (virtual interface) and cpu1 for pkt1 and pkt2.