existing_ifaces = mydb.get_rows(SELECT=('i.uuid as uuid', 'i.type as iface_type'),
FROM="interfaces as i join vms on i.vm_id=vms.uuid",
WHERE={'vnf_id': vnf_index2vnf_uuid[vnf_index],
existing_ifaces = mydb.get_rows(SELECT=('i.uuid as uuid', 'i.type as iface_type'),
FROM="interfaces as i join vms on i.vm_id=vms.uuid",
WHERE={'vnf_id': vnf_index2vnf_uuid[vnf_index],