Made frontend_{int|ext}_ip and controller_ip in group_vars_all automatically.
Added/removed gather_facts in playbooks.
Added a new handler to stop mysql server on non-first controllers.
Made passwords automatically generated if absent.
Added set_ips playbook.
Modified when: conditions for mysql.
Made playbooks/set_{ips,vars}/check.yml and add password generator.
Applied new group variables.
Improved handling group variables.
Update check.yml for variable checking.
Don't make group variables facts when they are automatically generated.