This is due to nested virtualization. If you are running Contrail on top of ESXI as an VM, edit following files as follows,
/etc/nova/nova.conf
[compute] compute_driver = libvirt.LibvirtDriver
[libvirt] virt_type = qemu
/etc/nova/nova-compute.conf
[DEFAULT] compute_driver=libvirt.LibvirtDriver
[libvirt] virt_type=qemu ~