Queryized passwd function.

        self._vm_action(query, 'resume_vm')

    @listed

    def passwd(self, conn, login, password, method='ssha'):

    def passwd(self, conn, query, password, method='ssha'):

        '''

        Define a new password for specified user.

        '''

        self._server.conf.set_password(login, password, method)

        objects = self._server.list(query)

        for obj in objects:

            if 'a' not in obj:

                raise BadObjectError('All objects must have the "a" tag.')

        for obj in objects:

            self._server.conf.set_password(obj['a'], password, method)

    @listed

    def addaccount(self, conn, login, role, password=None):