'set next cfg file'

def startup_next_cfg_file(self):

    commands = list()
    cmd = {'output': None, 'command': ''}
    if self.slot:
        cmd['command'] = ('startup    saved-configuration    %s    slot    %s' % (self.cfg_file, self.slot))
        commands.append(cmd)
        self.updates_cmd.append(('startup    saved-configuration    %s    slot    %s' % (self.cfg_file, self.slot)))
        run_commands(self.module, commands)
        self.changed = True
    else:
        cmd['command'] = ('startup    saved-configuration    %s' % self.cfg_file)
        commands.append(cmd)
        self.updates_cmd.append(('startup    saved-configuration    %s' % self.cfg_file))
        run_commands(self.module, commands)
        self.changed = True
