vmm/virtualbox: Minor DOM parsing cleanup to update_uuid()
vmm/virtualbox: Minor DOM parsing cleanup to update_uuid()

- update_uuid(): Descend XML DOM tree using a loop

cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr