fix(centos8): Centos8 is EOL, need to change mirrors
fix(centos8): Centos8 is EOL, need to change mirrors

Since recently centos8 is EOL, and moved to a diffent mirror site,
we can't yum install on it, until patching the repo files.

Fix: #4393

scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests