Removed list_vm method.

    role_name = 'client'

    @pure

    @listed

    def list_vm(self):

        '''

        List all VMs on nodes.

        '''

        found_vm = []

        async_ids = set()

        # Send the asynchronous request to all nodes:

        for node in self._server.iterrole('node'):

            async_ids.add(node.async_call('list_vm'))

        # Wait for the response:

        responses = self._server.manager.wait(frozenset(async_ids), timeout=5)

        # Process the responses:

        for resp in responses:

            if resp['error'] is None:

                for vm in resp['return']:

                    found_vm.append(vm)

        return tuple(found_vm)

    def _list(self, query):

        # Contains all the objects to be filted: