!2313 fixed the repeated setting logic of memcg_swap_qos_enable

Merge Pull Request from: @zhangwei123171 
 
    
Now when echo 1 > /proc/sys/vm/memcg_swap_qos_enable multiple times,  memcg_swap_qos_reset will be called every time.

In a production environment, when memcg swap qos is working normally, operations Engineer may execute sysctl -p for other reasons, destroying the relationship between each container and its corresponding swapfile. 
 
Link:https://gitee.com/openeuler/kernel/pulls/2313

 

Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>