Description of problem:

Upgrading keepalived to 2.1.5 on RHEL8 or doing a fresh install of this version breaks the --log-facility(-S) rsyslog integration feature 

Version-Release number of selected component (if applicable):

keepalived-2.1.5-6.el8.x86_64 

How reproducible:

Always. Downgrading keepalived to 2.0.10 solves the issue

Steps to Reproduce:
1. Create a custom syslog facility:

    # echo "local0.*  /var/log/keepalived.log" > /etc/rsyslog.d/keepalived.conf

2. Enable --log-facility(-S) with the same log facility level on keepalived:

    # sed -i 's|KEEPALIVED_OPTIONS="-D"|KEEPALIVED_OPTIONS="-D -d -S 0"|g' /etc/sysconfig/keepalived 

3. Restart keepalived and rsyslog:

    systemctl restart rsyslog
    systemctl restart keepalived


Actual results:

keepalived keeps writing to /var/log/messages


Expected results:

keepalived should write to any logfile configured on a rsyslog custom facility

Additional info:

There is a discussion on keepalived upstream that seems to be related with this regression here: https://github.com/acassen/keepalived/issues/1836

Some commits got reverted while others pushed to fix this issue.

Also, see case 02983056 for further information.