CentOS 8 support

- Update ChefSpec

Depends-On: https://review.opendev.org/c/openstack/openstack-chef/+/814234
Change-Id: I4593ffcb9700b232a1879a08e6bbd9cdaf76c222
Signed-off-by: Lance Albertson <lance@osuosl.org>

spec/rabbitmq-server-redhat_spec.rb

@@ -1,8 +1,9 @@
 require_relative 'spec_helper'
 
 describe 'openstack-ops-messaging::rabbitmq-server' do
-  describe 'redhat' do
-    let(:runner) { ChefSpec::SoloRunner.new(REDHAT_OPTS) }
+  ALL_RHEL.each do |p|
+    context "redhat #{p[:version]}" do
+      let(:runner) { ChefSpec::SoloRunner.new(p) }
       let(:node) { runner.node }
       cached(:chef_run) { runner.converge(described_recipe) }
 
@@ -13,3 +14,4 @@ describe 'openstack-ops-messaging::rabbitmq-server' do
       end
     end
   end
+end

spec/spec_helper.rb

@@ -7,10 +7,21 @@ RSpec.configure do |config|
   config.log_level = :warn
 end
 
-REDHAT_OPTS = {
+REDHAT_7 = {
   platform: 'redhat',
   version: '7',
 }.freeze
+
+REDHAT_8 = {
+  platform: 'redhat',
+  version: '8',
+}.freeze
+
+ALL_RHEL = [
+  REDHAT_7,
+  REDHAT_8,
+].freeze
+
 UBUNTU_OPTS = {
   platform: 'ubuntu',
   version: '18.04',