oso_monitoring: add the zabbix libs

roles/oso_monitoring_tools/tasks/main.yml

@@ -7,6 +7,7 @@
   with_items:
     - openshift-tools-scripts-monitoring-zagg-client
     - python-openshift-tools-monitoring-zagg
+    - python-openshift-tools-monitoring-zabbix
 
 - debug: var=g_zagg_client_config