fence_aliyun fails on RHEL 8 with "NameError: name 'client' is not defined"

Issue

• fence_aliyun commands fail on RHEL 8 with "NameError: name 'client' is not defined".

[root@rhel-8-node1 ~]# fence_aliyun -r us-west-1 -a <access_key> -s <secret_key> -o list
Traceback (most recent call last):
  File "/usr/sbin/fence_aliyun", line 160, in <module>
    main()
  File "/usr/sbin/fence_aliyun", line 152, in main
    conn = client.AcsClient(access_key, secret_key, region)
NameError: name 'client' is not defined