vnf creation with parameter 'thread_allocation=avoid' should not place vnf on compute host with hyperthreads

vnf creation when following parameter is given,
cpu_allocation:

    cpu_affinity: dedicated
    thread_allocation: avoid
      properties:
        image: cirros-0.3.4-x86_64-uec
        mgmt_driver: noop
        availability_zone: dedicated_compute_nodes

the vnf need to be placed only on host without hyperthreads.
In above example, when 'dedicated_compute_nodes' availability zone contains nodes both with and without hyperthreads enabled, vnf should be placed on nodes only without hypertheading.
However, vnfs are placed in regular round robin way.