Run unittests and lint tests on CentOS8

This patch introduces a job to run unit tests and lint tests on
CentOS8, as we are migrating from CentOS7 to CentOS8.

Note that we have a job with puppet 5.5 initially, because we still
use puppet 5.5 in rdo train, but puppet 5 will be deprecated in Ussri.

Change-Id: Id643efdbab93f39ce3b168a2d1c451035547ecab

zuul.d/layout.yaml

@@ -31,9 +31,13 @@
         - puppet-openstack-libraries-puppet-lint-ubuntu-bionic
         - puppet-openstack-libraries-puppet-syntax-4-centos-7
         - puppet-openstack-libraries-puppet-syntax-5-centos-7
+        - puppet-openstack-libraries-puppet-syntax-5-centos-8
+        - puppet-openstack-libraries-puppet-syntax-6-centos-8
         - puppet-openstack-libraries-puppet-syntax-6-ubuntu-bionic
         - puppet-openstack-libraries-puppet-unit-4.10-centos-7
         - puppet-openstack-libraries-puppet-unit-5.5-centos-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-unit-latest-ubuntu-bionic
         - puppet-openstack-libraries-puppet-beaker-rspec-centos-7

zuul.d/libraries.yaml

@@ -16,6 +16,23 @@
     vars:
       puppet_gem_version: 5.5
 
+- job:
+    name: puppet-openstack-libraries-puppet-unit-5.5-centos-8
+    parent: puppet-openstack-libraries-puppet-unit-base
+    nodeset: centos-8
+    voting: false
+    branches: ^(?!stable/(ocata|pike|queens|rocky|stein)).*$
+    vars:
+      puppet_gem_version: 5.5
+
+- job:
+    name: puppet-openstack-libraries-puppet-unit-6.11-centos-8
+    parent: puppet-openstack-libraries-puppet-unit-base
+    nodeset: centos-8
+    voting: false
+    branches: ^(?!stable/(ocata|pike|queens|rocky|stein)).*$
+    vars:
+      puppet_gem_version: 6.11
 
 - job:
     name: puppet-openstack-libraries-puppet-unit-6.11-ubuntu-bionic

zuul.d/linters.yaml

@@ -74,3 +74,21 @@
     branches: ^(?!stable/(ocata|pike|queens|rocky|jewel|mimic|luminous)).*$
     vars:
       puppet: 6
+
+- job:
+    name: puppet-openstack-libraries-puppet-syntax-5-centos-8
+    parent: puppet-openstack-libraries-puppet-syntax
+    nodeset: centos-8
+    voting: false
+    branches: ^(?!stable/(ocata|pike|queens|rocky|stein)).*$
+    vars:
+      puppet: 5
+
+- job:
+    name: puppet-openstack-libraries-puppet-syntax-6-centos-8
+    parent: puppet-openstack-libraries-puppet-syntax
+    nodeset: centos-8
+    voting: false
+    branches: ^(?!stable/(ocata|pike|queens|rocky|stein)).*$
+    vars:
+      puppet: 6

zuul.d/unit.yaml

@@ -16,6 +16,24 @@
     vars:
       puppet_gem_version: 5.5
 
+- job:
+    name: puppet-openstack-unit-5.5-centos-8
+    parent: puppet-openstack-unit-base
+    nodeset: centos-8
+    voting: false
+    branches: ^(?!stable/(ocata|pike|queens|rocky|stein)).*$
+    vars:
+      puppet_gem_version: 5.5
+
+- job:
+    name: puppet-openstack-unit-6.11-centos-8
+    parent: puppet-openstack-unit-base
+    nodeset: centos-8
+    voting: false
+    branches: ^(?!stable/(ocata|pike|queens|rocky|stein)).*$
+    vars:
+      puppet_gem_version: 6.11
+
 - job:
     name: puppet-openstack-unit-6.11-ubuntu-bionic
     parent: puppet-openstack-unit-base
@@ -42,6 +60,8 @@
       jobs:
         - puppet-openstack-unit-4.10-centos-7
         - puppet-openstack-unit-5.5-centos-7
+        - puppet-openstack-unit-5.5-centos-8
+        - puppet-openstack-unit-6.11-centos-8
         - puppet-openstack-unit-6.11-ubuntu-bionic
         - puppet-openstack-unit-latest-ubuntu-bionic
     gate: