Merge "Fix monasca-thresh upgrade"

ansible/roles/monasca/tasks/upgrade.yml

@@ -20,6 +20,7 @@
     common_options: "{{ docker_common_options }}"
     name: "{{ monasca_services['monasca-thresh']['container_name'] }}"
   when:
+    - inventory_hostname in groups['monasca-thresh']
     - inventory_hostname != groups['monasca-thresh']|first
 
 - name: Flush handlers