Add CI jobs on CentOS 8 Stream
Add CI jobs on CentOS 8 Stream

As part of the transition to CentOS 8 Stream, we are adding CI jobs to
be executed on C8S in addition to current C8 ones.

Depends-On: https://review.opendev.org/c/zuul/zuul-jobs/+/770815
Change-Id: I69711a7a3c2cf7ed1f174ae98be5638b564eb2eb

fr34k8/packstack,openstack/packstack,mahak/packstack,fr34k8/packstack,stackforge/packstack,openstack/packstack,fr34k8/packstack,mahak/packstack,stackforge/packstack,openstack/packstack,mahak/packstack,stackforge/packstack