Remove logic for CentOS < 9

... because RDO supports CentOS Stream 9 (aka CentOS 9) only since Zed.

Change-Id: I7514c4384a15b235a54f1c310f6d0167089e0515

manifests/params.pp

@@ -57,13 +57,8 @@ class ironic::params {
       $uefi_ipxe_bootfile_name   = 'snponly.efi'
       $ironic_wsgi_script_path   = '/var/www/cgi-bin/ironic'
       $ironic_wsgi_script_source = '/usr/bin/ironic-api-wsgi'
-      if (Integer.new($::os['release']['major']) > 8) {
-        $xinetd_available        = false
-        $tftpd_package           = false
-      } else {
-        $xinetd_available        = true
-        $tftpd_package           = 'tftp-server'
-      }
+      $xinetd_available          = false
+      $tftpd_package             = false
       $ipxe_package              = 'ipxe-bootimgs'
       $pxelinux_package          = false
       $pxelinux_path             = false

spec/classes/ironic_pxe_spec.rb

@@ -409,11 +409,8 @@ describe 'ironic::pxe' do
         it_behaves_like 'ironic pxe without xinetd'
       end
 
-      unless facts[:osfamily] == 'RedHat' and facts[:operatingsystemmajrelease].to_i >= 9
-        it_behaves_like 'ironic pxe with xinetd'
-      end
-
       if facts[:osfamily] == 'Debian'
+        it_behaves_like 'ironic pxe with xinetd'
         it_behaves_like 'ironic pxe with pxelinux package' 
       end
     end