Neutron ML2 + linuxbridge

  [x] Tested CI run with Open vSwitch plugin + VXLAN using 3.5 kernel
  [x] Tested CI run with ML2 + linuxbridge + VXLAN using 3.9 kernel

this line appears to fail with an error when enable_lbaas is set to false.   I'll debug and send a PR to fix it when I have time to debug through it.