Allow contrail-vrouter-dpdk to build inside a VM by specifying the CPU architecture to gcc.
Allow contrail-vrouter-dpdk to build inside a VM by specifying the
CPU architecture to gcc.

Change-Id: Id17cd6ee438e132a5fa99d0b14188e9cdf120426
Closes-Bug: #1396396

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