cleanup Ubuntu pre-20.04 code

We dropped support for 18.04 a while ago, but didn't clean up all the
conditionals.

Fixes: c5453d6

Author: evgeni

manifests/plugin/ansible/params.pp

@@ -18,7 +18,7 @@
       $runner_package_name = 'ansible-runner'
     }
     'Debian': {
-      if ($facts['os']['name'] == 'Ubuntu' and versioncmp($facts['os']['release']['major'], '20.04') >= 0) {
+      if ($facts['os']['name'] == 'Ubuntu') {
         $callback = 'theforeman.foreman.foreman'
       } else {
         $callback = 'foreman'

spec/acceptance/netboot_spec.rb

@@ -5,15 +5,9 @@
 
   include_examples 'the example', 'tftp.pp'
 
-  root = case host_inventory['facter']['os']['name']
+  root = case host_inventory['facter']['os']['family']
          when 'Debian'
            '/srv/tftp'
-         when 'Ubuntu'
-           if host_inventory['facter']['os']['release']['major'].to_f >= 20.04
-             '/srv/tftp'
-           else
-             '/var/lib/tftpboot'
-           end
          else
            '/var/lib/tftpboot'
          end