Fix Virtuozzo CI
Fix Virtuozzo CI

Don't specify hypervisor_type=vz property for hds images as nova
now reports only really connected hypervisors and not all supported
by a compute host

Change-Id: Ibec0856519ffe593d44d123f3b401eae19f7d95a

nawawi/openstack,openstack-dev/devstack,openstack-dev/devstack,dtroyer/devstack,noironetworks/devstack,nawawi/openstack,group-policy/devstack,noironetworks/devstack,dtroyer/devstack,group-policy/devstack