CI: Ignore .zuul.d

Zuul handles jobs updates just fine, no need to run kolla build
jobs when touching .zuul.d for different reasons.

Change-Id: I201a194fa473a63b880cefc00febb543b40bcec8
(cherry picked from commit a008749)

Author: yoctozepto

.zuul.d/base.yaml

@@ -54,6 +54,7 @@
       - ^releasenotes/.*$
       - ^specs/.*$
       - ^test-requirements.txt$
+      - ^\.zuul\.d/
     vars:
       publisher: false
     extra-vars:

.zuul.d/centos.yaml

@@ -11,7 +11,6 @@
             # FIXME(yoctozepto): set to voting when TripleO CI is fixed
             voting: false
             files:
-              - ^.zuul.d/centos.yaml$
               - ^docker/.*$
               - ^kolla/.*$
               - ^requirements.txt$