Catch exception on stop action.

    def vm_stop(self, vm_names=None, force=False):

        logger.debug('VM stop')

        for vm in self.iter_vms(vm_names):

            try:

                if force:

                    vm.destroy()

                else:

                    vm.stop()

            except libvirt.libvirtError:

                # should we return errors ?

                pass

    def vm_start(self, vm_names=None):

        logger.debug('VM start')