Fix Creating Panko MongoDB database failed

The check whether 'already' presents in mongodb output
should belong to changed_when.

Change-Id: I829c8906f0f7b61d3f6e0211319899d126e6850c
Closes-Bug: #1668216

ansible/roles/panko/tasks/bootstrap.yml

@@ -3,9 +3,8 @@
   command: docker exec -t mongodb mongo --host {{ panko_database_mongodb_address }} --eval 'db = db.getSiblingDB("{{ panko_database_name }}"); db.createUser({user':' "{{ panko_database_user }}", pwd':' "{{ panko_database_password }}", roles':' [ "readWrite", "dbAdmin" ]})'
   register: mongodb_panko_database
   run_once: true
-  failed_when:
-    - "'already' not in mongodb_panko_database.stdout"
-    - mongodb_panko_database.stdout.split()[4] != 'connecting'
+  changed_when: "{{ 'already' not in mongodb_panko_database.stdout }}"
+  failed_when: "{{ mongodb_panko_database.rc != 0 or mongodb_panko_database.stdout.split()[4] != 'connecting' }}"
   delegate_to: "{{ groups['mongodb'][0] }}"
   when:
     - panko_database_type == "mongodb"