Fix Centos8 tests

[dzmitry-rudnouski]

SUMMARY

Centos8 tests failed

ISSUE TYPE

• Bug Report

TASK [Enable EPEL repository] **************************************************
Monday 31 January 2022  11:03:44 +0000 (0:00:05.255)       0:00:05.283 ********
FAILED - RETRYING: Enable EPEL repository (3 retries left).
FAILED - RETRYING: Enable EPEL repository (2 retries left).
FAILED - RETRYING: Enable EPEL repository (1 retries left).
fatal: [test-aws-centos8-dragonwell8]: FAILED! => changed=false 
  attempts: 3
  msg: 'Failed to download metadata for repo ''appstream'': Cannot prepare internal mirrorlist: No URLs in mirrorlist'