Running dpdk test job on a sinlge node env
does not require a real hardware dpdk interfaces
to be attached to the tunnel bridge. Let's
make the list of dpdk interfaces empty which
will allow us to test the Openvswitch in user space
but not touch real hardware.
Change-Id: I2f9d954258451f64eb87d03affc079b71b00f7bd
Co-Authored-By: Arina Stebenkova <astebenkova@mirantis.com>