(IAC-787) Back out itk_spec.rb:19 on RHEL 8.x

Author: Ciaran McCrisken

spec/acceptance/itk_spec.rb

@@ -14,7 +14,9 @@
   variant = :prefork
 end
 
-describe 'apache::mod::itk class', if: service_name do
+# IAC-787: The http-itk mod package is not available in any of the standard RHEL/CentOS 8.x repos. Disable this test
+# on those platforms until we can find a suitable source for this package.
+describe 'apache::mod::itk class', if: service_name, unless: os[:family] == 'redhat' && os[:release].to_i >= 8 do
   describe 'running puppet code' do
     let(:pp) do
       case variant