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 a0087490ff)

.zuul.d/base.yaml

@@ -60,6 +60,7 @@
       - ^releasenotes/.*$
       - ^specs/.*$
       - ^test-requirements.txt$
+      - ^\.zuul\.d/
     vars:
       publisher: false
     extra-vars:

.zuul.d/centos.yaml

@@ -14,7 +14,6 @@
         - tripleo-build-containers-centos-7:
             voting: true
             files:
-              - ^.zuul.d/centos.yaml$
               - ^docker/.*$
               - ^kolla/.*$
               - ^requirements.txt$