Fixes #38647: kickstart default drop EOL conditions

Remove conditions related to EOL OSes (EL5/6, Fedora < 16/19/28)

Author: d1nuc0m

app/views/unattended/provisioning_templates/provision/kickstart_default.erb

@@ -63,15 +63,15 @@ description: |
   is_fedora = @host.operatingsystem.name == 'Fedora'
   os_major = @host.operatingsystem.major.to_i
   os_minor = @host.operatingsystem.minor.to_i
-  realm_compatible = (@host.operatingsystem.name == 'Fedora' && os_major >= 20) || (rhel_compatible && os_major >= 7)
+  realm_compatible = (@host.operatingsystem.name == 'Fedora' && os_major >= 20) || rhel_compatible
   # safemode renderer does not support unary negation
   proxy_uri = host_param('http-proxy') ? "http://#{host_param('http-proxy')}:#{host_param('http-proxy-port')}" : nil
   proxy_string = proxy_uri ? " --proxy=#{proxy_uri}" : ''
   puppet_enabled = !host_param_true?('skip-puppet-setup') && (host_puppet_server.present? || host_param_true?('force-puppet'))
   salt_enabled = host_param('salt_master') ? true : false
   chef_enabled = @host.respond_to?(:chef_proxy) && @host.chef_proxy
-  section_end = (rhel_compatible && os_major <= 5) ? '' : '%end'
-  use_ntp = host_param_true?('use-ntp', (is_fedora && os_major < 16) || (rhel_compatible && os_major <= 6))
+  section_end = '%end'
+  use_ntp = host_param_true?
   iface = @host.provision_interface
   appstream_present = false
   use_rhsm = (@host.operatingsystem.name == 'RedHat' || @host.operatingsystem.name == 'RHEL') && os_major >= 9
@@ -88,7 +88,7 @@ if plugin_present?('katello')
 # Content Source: <%= @host.content_source %>
 <% end -%>
 
-<% if (is_fedora && os_major < 29) || (rhel_compatible && os_major <= 7) -%>
+<% if rhel_compatible && os_major <= 7 -%>
 install
 <% end -%>
 <%
@@ -138,7 +138,7 @@ rootpw --iscrypted <%= root_pass %>
 <% if host_param_true?('disable-firewall') -%>
 firewall --disable
 <% else -%>
-firewall --<%= os_major >= 6 ? 'service=' : '' %>ssh
+firewall --service=ssh
 <% end -%>
 <%# Kdump -%>
 <% if host_param('kdump-options').present? -%>
@@ -178,16 +178,7 @@ realm join --one-time-password='<%= @host.otp || "$HOST[OTP]" %>' <%= @host.real
 repo --name="Server-Mysql"
 <% end -%>
 
-<% if @host.operatingsystem.name == 'Fedora' && os_major <= 16 -%>
-# Bootloader exception for Fedora 16:
-bootloader --append="<%= host_param('bootloader-append') || 'nofb quiet splash=quiet' %> <%= ks_console %>" <%= grub_pass %>
-part biosboot --fstype=biosboot --size=1
-<% else -%>
 bootloader --location=mbr --append="<%= host_param('bootloader-append') || 'nofb quiet splash=quiet' %>" <%= grub_pass %>
-<% if os_major == 5 -%>
-key --skip
-<% end -%>
-<% end -%>
 
 <% if @dynamic -%>
 %include /tmp/diskpart.cfg
@@ -339,11 +330,7 @@ cp -vf /tmp/*.pre.*.log /mnt/sysimage/root/
 <%#
 The last post section halts Anaconda to prevent endless loop in case HTTP request fails
 %>
-<% if (is_fedora && os_major < 20) || (rhel_compatible && os_major < 7) -%>
-%post
-<% else -%>
 %post --erroronfail --log=/root/install-callhome.post.log
-<% end -%>
 
 <%= snippet 'eject_cdrom' -%>