CI: follow-up on TripleO demotion - no gating

Backported to Stein already.
See also: https://review.opendev.org/677144

Change-Id: Ic2948953b9e8cd5148d6bde539003ab9d081b215
Signed-off-by: Radosław Piliszek <radoslaw.piliszek@gmail.com>

.zuul.d/centos.yaml

@@ -34,16 +34,6 @@
       queue: kolla
       jobs:
         - kolla-build-centos-source
-        - tripleo-build-containers-centos-7:
-            # FIXME(yoctozepto): set to voting when TripleO CI is fixed
-            voting: false
-            files:
-              - ^.zuul.d/centos.yaml$
-              - ^docker/.*$
-              - ^kolla/.*$
-              - ^requirements.txt$
-              - ^setup.cfg$
-              - ^setup.py$
     periodic:
       jobs:
         - kolla-publish-centos-source: