[ OVN ][Migration] Reload systemctl daemon after removal

After stopping and deleting the services if this role is runned
again it could fail bc systemd has still some ovs services loaded
(eventhough the service is stopped) this will cause that ansible
will try to delete again and fail while trying to disable and
delete the service.

Change-Id: If51d7f25375768f8c60492c84d84e91d91886025
(cherry picked from commit 5ee94a5b9b)

tools/ovn_migration/tripleo_environment/playbooks/roles/stop-agents/tasks/main.yml

@@ -9,6 +9,10 @@
     loop_var: service
   when: ansible_facts.services[service.service_file] is defined
 
+- name: Reload systemctl daemons
+  systemd:
+    daemon_reload: yes
+
 - name: remove containers
   become: yes
   shell: |