RDO has switched to use centos-8-stream to build and validate spec
changes in RDO Trunk for master. Also, now puppet-promotion pipeline is
using both CentOS Linux 8 and CentOS Stream 8 as promotion criteria.
This patch is adding CentOS 8 stream jobs in puppet-openstack projects.
First, i'm adding them to check pipelines as non-voting and once we
check they are stable we can move them to voting.
Change-Id: I6d5c26585a5f5687584a63435ce5cebba7ffae79
acb80f48a2