After I13fd2dc023b806ac74ab5c8d86cc99f807f0f702 the base job
tempest-multinode-full-py3 does not have the MinBwAllocationPlacementTest
tempest tests enabled by default. So enable it in
neutron-ovs-tempest-multinode-full not to lose any test covereage
Change-Id: I6967b55e8ce8d422422e943818145b718cd10f02