replace yum with dnf

roles/openshift_cli/tasks/main.yml

@@ -6,7 +6,7 @@
       cli_image: "{{ osm_image | default(None) }}"
       
 - name: Install clients
-  yum: pkg={{ openshift.common.service_type }}-clients state=installed
+  action: "{{ ansible_pkg_mgr }} name={{ openshift.common.service_type }}-clients state=present"
   when: not openshift.common.is_containerized | bool
   
 - name: Pull CLI Image