Unbreak CI: fluentd and TripleO dependency

fluentd - we are not deploying kubernetes, no need for plugins
TripleO - CI currently broken (to reverse, FIXME in place)
- dropped TripleO from gate

Change-Id: I203f70176af7f2b53398ddeb5c21e6234a45e268
Signed-off-by: Radosław Piliszek <radoslaw.piliszek@gmail.com>
(cherry picked from commit 07b55048e6)

.zuul.d/centos.yaml

@@ -8,7 +8,8 @@
         - kolla-ansible-centos-binary
         - kolla-ansible-centos-source-upgrade
         - tripleo-build-containers-centos-7:
-            voting: true
+            # FIXME(yoctozepto): set to voting when TripleO CI is fixed
+            voting: false
             files:
               - ^.zuul.d/centos.yaml$
               - ^docker/.*$
@@ -24,15 +25,6 @@
       queue: kolla
       jobs:
         - kolla-build-centos-source
-        - tripleo-build-containers-centos-7:
-            voting: true
-            files:
-              - ^.zuul.d/centos.yaml$
-              - ^docker/.*$
-              - ^kolla/.*$
-              - ^requirements.txt$
-              - ^setup.cfg$
-              - ^setup.py$
     periodic:
       jobs:
         - kolla-publish-centos-source

docker/fluentd/Dockerfile.j2

@@ -21,7 +21,6 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
         'ruby-devel',
         'rubygem-fluent-plugin-elasticsearch',
         'rubygem-fluent-plugin-grok-parser',
-        'rubygem-fluent-plugin-kubernetes_metadata_filter',
         'rubygem-fluent-plugin-rewrite-tag-filter',
         'rubygem-fluent-plugin-secure-forward'
     ] %}
@@ -65,7 +64,6 @@ RUN chmod 755 /usr/local/bin/kolla_extend_start
         'fluent-plugin-elasticsearch',
         'fluent-plugin-grep',
         'fluent-plugin-grok-parser:2.1.4',
-        'fluent-plugin-kubernetes_metadata_filter',
         'fluent-plugin-parser',
         'fluent-plugin-rewrite-tag-filter:2.0.0',
         'fluent-plugin-secure-forward',