Add task to ensure MongoDB is running in Ansible

deployment/ansible-role-mongodb/tasks/config_system.yml

@@ -28,3 +28,6 @@
 - name: restart mongodb if config changed
   service: name={{ mongodb_daemon_name }} state=restarted
   when: mongodb_conf|changed
+
+- name: ensure mongodb is running
+  wait_for: host={{ mongodb_conf_bind_ip }} port={{ mongodb_conf_port }}