* added parameters "enable_script_security" and "script_user root" into keepalived.conf;
https://www.keepalived.org/manpage.html

* haproxy_check vrrp script moved into /usr/libexec/keepalived directory;

* Restart the keepalived service only during the initial installation or after modification of the configuration file or haproxy_check script.
Do not restart the service when re-executing this playbook.