!1718 ignore the rt /dl task in tg_change_scheduler

Merge Pull Request from: @zhangwei123171 
 

When switching the sched policy of the container process through qos_level, 
you need to ignore the rt/dl task。


Both online task and offline task are limited to the cfs scheduling class。 
 
Link:https://gitee.com/openeuler/kernel/pulls/1718

 

Reviewed-by: zhao xiaoqiang <zhaoxiaoqiang11@jd.com>
Reviewed-by: sanglipeng <sanglipeng1@jd.com>
Reviewed-by: Zucheng Zheng <zhengzucheng@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>