Ansible flush_handlers ignores conditional clauses

The flush_handlers clause doesn't honour conditional clauses.
Instead, it prints a warning and runs anyway:
[WARNING]: flush_handlers task does not support when conditional

See: https://github.com/ansible/ansible/pull/41126

TrivialFix

Change-Id: Iaf70c2e932ae6dfb723bdb2ba658acdbfe74ebe2

ansible/roles/haproxy/tasks/upgrade.yml

@@ -11,12 +11,5 @@
     name: "keepalived"
   when: kolla_internal_vip_address not in secondary_addresses
 
-# Upgrading master keepalived and haproxy
 - name: Flush handlers
   meta: flush_handlers
-  when: kolla_internal_vip_address in secondary_addresses
-
-# Upgrading slave keepalived and haproxy
-- name: Flush handlers
-  meta: flush_handlers
-  when: kolla_internal_vip_address not in secondary_addresses