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

This reverts commit 0de0ebf0987c2cd92a3a880de822f3616480d2d5.

Reason for revert: Try with workaround merged in https://review.opendev.org/c/openstack/devstack/+/824862

Change-Id: Iafff24bf829da1d399fed4ca16a62f24196cd4af
2 files changed