Fix playbook stopping wrong services

Similar fix to #1073.

Author: priteau

etc/kayobe/ansible/stop-openstack-services.yml

@@ -26,4 +26,4 @@
   tasks:
     - name: Stop OpenStack services
       shell: >-
-        systemctl -a | egrep '({{ stop_service_list | join('|') }})' | awk '{ print $1 }' | xargs systemctl stop
+        systemctl -a | egrep 'kolla-({{ stop_service_list | join('|') }})' | awk '{ print $1 }' | xargs systemctl stop