use the correct name for the ruamel-yaml python module

roles/lib_openshift/tasks/main.yml

@@ -1,12 +1,5 @@
 ---
 - name: lib_openshift ensure python-ruamel-yaml package is on target
   package:
-    name: "{{ item }}"
+    name: python-ruamel-yaml
     state: present
-  with_items:
-  - ruamel.yaml
-  - ruamel.yaml
-  - ruamel.yaml
-  - ruamel.yaml
-  - ruamel.yaml
-  - ruamel.yaml