Drop the tripleo-puppet-undercloud job

... because Swift is no longer enabled in Undercloud by default.[1]

[1] b3f4111c9ebb6ebd572b734a46b1d58e2875bd55

Change-Id: I61c2ced2935a88b4a86b0a9b8cc64efbbe027bd4

.zuul.yaml

@@ -4,26 +4,13 @@
       - puppet-openstack-module-unit-jobs
       - puppet-openstack-integration-jobs-scenario002
       - puppet-openstack-litmus-jobs
-      - tripleo-puppet-undercloud
       - release-notes-jobs-python3
     check:
       jobs:
-        - tripleo-ci-centos-8-content-provider
-        - puppet-swift-tripleo-standalone:
-            vars: &standalone_consumer_vars
-              consumer_job: true
-              build_container_images: false
-              remove_tags:
-                - build
-            dependencies:
-              - tripleo-ci-centos-8-content-provider
+        - puppet-swift-tripleo-standalone
     gate:
       jobs:
-        - tripleo-ci-centos-8-content-provider
-        - puppet-swift-tripleo-standalone:
-            vars: *standalone_consumer_vars
-            dependencies:
-              - tripleo-ci-centos-8-content-provider
+        - puppet-swift-tripleo-standalone
 
 - job:
     name: puppet-swift-tripleo-standalone