Modified the error message being checked for

roles/nuage_master/tasks/serviceaccount.yml

@@ -29,7 +29,7 @@
     --config={{nuage_tmp_conf}}
   with_items: "{{nuage_tasks}}"
   register: osnuage_perm_task
-  failed_when: "'already exists' not in osnuage_perm_task.stderr and osnuage_perm_task.rc != 0"
+  failed_when: "'the object has been modified' not in osnuage_perm_task.stderr and osnuage_perm_task.rc != 0"
   changed_when: osnuage_perm_task.rc == 0
 
 - name: Generate the node client config