Disable CentOS7 beaker job

This patch disables CentOS7 beaker job so that we can switch to CentOS8
to run beaker tests, since CentOS7 is no longer supported.
Currently CentOS8 beaker job is still non-voting, but will be made
voting soon once we adjust current pinning for CentOS7[1]

[1] https://review.opendev.org/#/c/726498/

Conflicts:
	zuul.d/layout.yaml

Change-Id: Iad2dc427919788f8fc9122a05cd36d9d6e50b11a
(cherry picked from commit 7c4b45ba46)

zuul.d/base.yaml

@@ -176,14 +176,6 @@
       - ^setup.cfg$
       - ^setup.py$
 
-- job:
-    name: puppet-openstack-beaker-centos-7
-    parent: puppet-openstack-beaker-run-base
-    nodeset: centos-7
-    vars:
-      nodepool_type: centos7
-      puppet_gem_version: 5.5
-
 - job:
     name: puppet-openstack-beaker-centos-8
     parent: puppet-openstack-beaker-run-base

zuul.d/beaker.yaml

@@ -2,34 +2,11 @@
     name: puppet-openstack-beaker-jobs
     check:
       jobs:
-        - puppet-openstack-beaker-centos-7
         - puppet-openstack-beaker-centos-8
         - puppet-openstack-beaker-ubuntu-bionic
     gate:
       jobs:
-        - puppet-openstack-beaker-centos-7
-
-- job:
-    name: puppet-openstack-libraries-puppet-beaker-rspec-centos-7
-    parent: puppet-openstack-integration-base
-    pre-run: playbooks/prepare-node-beaker.yaml
-    post-run: playbooks/upload-logs.yaml
-    run: playbooks/run-libraries-beaker-tests.yaml
-    timeout: 3600
-    nodeset: centos-7
-    irrelevant-files:
-      - ^.*\.md$
-      - ^.*\.rst$
-      - ^doc/.*$
-      - ^etc/.*$
-      - ^metadata.json$
-      - ^releasenotes/.*$
-      - ^test-requirements.txt$
-      - ^LICENSE$
-      - ^.gitignore$
-    vars:
-      nodepool_type: centos7
-      puppet_gem_version: 5.5.0
+        - puppet-openstack-beaker-centos-8
 
 - job:
     name: puppet-openstack-libraries-puppet-beaker-rspec-centos-8

zuul.d/layout.yaml

@@ -34,7 +34,6 @@
         - puppet-openstack-libraries-puppet-unit-6.11-centos-8
         - puppet-openstack-libraries-puppet-unit-6.11-ubuntu-bionic
         - puppet-openstack-libraries-puppet-unit-latest-ubuntu-bionic
-        - puppet-openstack-libraries-puppet-beaker-rspec-centos-7
         - puppet-openstack-libraries-puppet-beaker-rspec-centos-8
         - puppet-openstack-libraries-puppet-beaker-rspec-ubuntu-bionic
     gate:
@@ -46,7 +45,7 @@
         - puppet-openstack-libraries-puppet-unit-5.5-centos-8
         - puppet-openstack-libraries-puppet-unit-6.11-centos-8
         - puppet-openstack-libraries-puppet-unit-6.11-ubuntu-bionic
-        - puppet-openstack-libraries-puppet-beaker-rspec-centos-7
+        - puppet-openstack-libraries-puppet-beaker-rspec-centos-8
 
 # integration jobs
 - project-template: