'Deletes the value from the xenstore record for the given VM at
the specified location.  A XenAPIPlugin.PluginError will be
raised if any error is encountered in the delete process.'

def _delete_from_xenstore(self, instance, path, vm_ref=None):

    dom_id = self._get_dom_id(instance, vm_ref)
    try:
        return host_xenstore.delete_record(self._session, dom_id, path)
    except XenAPI.Failure as e:
        return self._process_plugin_exception(e, 'delete_record', instance)
