Revert "Revert "Make centos8 stream job non voting for bug#1957941""

This reverts commit 1e2fe4fb33cd1ef8f0067a3aa2ef8c10c0ba0d2a.

Reason for revert: they started failing again with RETRY_LIMIT  

https://zuul.openstack.org/builds?job_name=tempest-integrated-compute-centos-8-stream&job_name=tempest+tempest-full-py3-centos-8-stream&skip=0

Change-Id: I42f4991d786e74512a666cc12b7901f5effcf10b
2 files changed