Remove TripleO job

... because TripleO has switched to the independent release model and
its Yoga release is not being created.

Change-Id: I0ed0caf9861fa09226132d90c04942c80e247065

zuul.d/tripleo.yaml

@@ -1,78 +0,0 @@
----
-# This file contains the tripleo jobs for the puppet modules
-#
-- job:
-    name: tripleo-puppet-ci-centos-8-undercloud-containers
-    parent: tripleo-ci-centos-8-undercloud-containers
-    irrelevant-files: &irrelevant_files
-      - ^.*\.md$
-      - ^.*\.rst$
-      - ^doc/.*$
-      - ^etc/.*$
-      - ^examples/.*$
-      - ^metadata.json$
-      - ^releasenotes/.*$
-      - ^spec/.*$
-      - ^requirements.txt$
-      - ^test-requirements.txt$
-      - ^LICENSE$
-      - ^.gitreview$
-      - ^.gitignore$
-      - ^setup.cfg$
-      - ^setup.py$
-      - ^tox.ini$
-
-- job:
-    name: tripleo-puppet-ci-centos-8-content-provider
-    parent: tripleo-ci-centos-8-content-provider
-    irrelevant-files: *irrelevant_files
-
-- project-template:
-    name: tripleo-puppet-undercloud
-    check:
-      jobs:
-        - tripleo-puppet-ci-centos-8-content-provider
-        - tripleo-puppet-ci-centos-8-undercloud-containers:
-            vars: &undercloud_consumer_vars
-              consumer_job: true
-              remove_tags:
-                - build
-            dependencies:
-              - tripleo-puppet-ci-centos-8-content-provider
-    gate:
-      jobs:
-        - tripleo-puppet-ci-centos-8-content-provider
-        - tripleo-puppet-ci-centos-8-undercloud-containers:
-            vars: *undercloud_consumer_vars
-            dependencies:
-              - tripleo-puppet-ci-centos-8-content-provider
-
-- job:
-    name: tripleo-puppet-ci-centos-8-standalone
-    parent: tripleo-ci-centos-8-standalone
-    irrelevant-files: *irrelevant_files
-    vars:
-      featureset_override:
-        standalone_environment_files:
-          - 'environments/low-memory-usage.yaml'
-
-- project-template:
-    name: tripleo-puppet-standalone
-    check:
-      jobs:
-        - tripleo-puppet-ci-centos-8-content-provider
-        - tripleo-puppet-ci-centos-8-standalone:
-            vars: &standalone_consumer_vars
-              consumer_job: true
-              build_container_images: false
-              remove_tags:
-                - build
-            dependencies:
-              - tripleo-puppet-ci-centos-8-content-provider
-    gate:
-      jobs:
-        - tripleo-puppet-ci-centos-8-content-provider
-        - tripleo-puppet-ci-centos-8-standalone:
-            vars: *standalone_consumer_vars
-            dependencies:
-              - tripleo-puppet-ci-centos-8-content-provider