TripleO: Do not use an independent content provide job

The tripleo-puppet-standalone template introduces a content provider
job and a subsequent job to use containers built by the content
provider job. This is inefficient because we run only a single tripleo
job.

Change-Id: Idb5b832d3243fd32b7d48615c7f41f96ce9054b8

.zuul.yaml

@@ -5,4 +5,22 @@
       - puppet-openstack-integration-jobs-all
       - puppet-openstack-litmus-jobs
       - release-notes-jobs-python3
-      - tripleo-puppet-standalone
+    check:
+      jobs:
+        - puppet-openstacklib-tripleo-standalone
+    gate:
+      jobs:
+        - puppet-openstacklib-tripleo-standalone
+
+- job:
+    name: puppet-openstacklib-tripleo-standalone
+    parent: tripleo-puppet-ci-centos-8-standalone
+    description: |
+      TripleO standalone Job running basic tests
+    vars:
+      build_container_images: true
+      featureset_override:
+        run_tempest: false
+        tempest_test_whitelist:
+          - 'tempest.scenario.test_server_basic_ops'
+        use_os_tempest: true