Fixes #35194 - add option for reboot --kexec to kickstart

Author: jcpunk

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

@@ -230,7 +230,7 @@ key --skip
 <% end -%>
 
 text
-reboot
+reboot<% if host_param_true?('install_reboot_kexec') %> --kexec<% end %>
 
 %packages
 <%= snippet_if_exists(template_name + " custom packages") %>