Recreate domain when libvirt send us a create event and domain already exists.

        event = EVENTS[event]

        if event == 'Added':

            if dom.name() in self.domains:

                # sometimes libvirt send us the same event multiple times

                # this can be the result of a change in the domain configuration

                # we first remove the old domain

                vm = self.domains.pop(dom.name())

                self.handler.tag_db.remove_sub_object(vm.name)

                logger.debug('Domain %s recreated', dom.name())

            vm = VirtualMachine(dom, self)

            logger.info('Created domain %s', vm.name)

            self.domains[vm.name] = vm