handler tasks don't get executed with ansible-core==2.15.0

[Roman Krček]

During OS deployment with kolla-ansible==17.0.0 and ansible-core==2.15.0 these following handlers don't get executed. This leads to nova-compute services not being able to register themselves.

Not executed handlers:
- Checking libvirt container
- Create libvirt SASL user

Upstream: https://github.com/ansible/ansible/issues/80880

The log from kolla-ansible shows:
Notification for handler Checking libvirt container is ready has been saved.
Notification for handler Create libvirt SASL user has been saved.

However, they are never executed. Upgrading to ansible-core==2.15.8 fixed the issue.