Fixes #38772 - Get rid of Grub (not grub2)

Follow up to theforeman/foreman#10698

Author: stejskalleos

modules/tftp/server.rb

@@ -92,21 +92,6 @@ def pxeconfig_file(mac)
     end
   end
   class Pxelinux < Syslinux; end
-
-  class Pxegrub < Server
-    def pxeconfig_dir
-      "#{path}/grub"
-    end
-
-    def pxe_default
-      ["#{pxeconfig_dir}/menu.lst", "#{pxeconfig_dir}/efidefault"]
-    end
-
-    def pxeconfig_file(mac)
-      ["#{pxeconfig_dir}/menu.lst.01" + mac.delete(':').upcase, "#{pxeconfig_dir}/01-" + dashed_mac(mac).upcase]
-    end
-  end
-
   class Pxegrub2 < Server
     def bootloader_path(os, release, arch)
       [release, "default"].each do |version|

modules/tftp/tftp_api.rb

@@ -8,7 +8,7 @@ class Api < ::Sinatra::Base
     helpers ::Proxy::Helpers
     authorize_with_trusted_hosts
     authorize_with_ssl_client
-    VARIANTS = ["Syslinux", "Pxelinux", "Pxegrub", "Pxegrub2", "Ztp", "Poap", "Ipxe"].freeze
+    VARIANTS = ["Syslinux", "Pxelinux", "Pxegrub2", "Ztp", "Poap", "Ipxe"].freeze
 
     helpers do
       def instantiate(variant, mac = nil)

test/tftp/tftp_api_test.rb

@@ -30,11 +30,6 @@ def test_instantiate_pxelinux
     assert_equal "Proxy::TFTP::Pxelinux", obj.class.name
   end
 
-  def test_instantiate_pxegrub
-    obj = app.helpers.instantiate "pxegrub", "AA:BB:CC:DD:EE:FF"
-    assert_equal "Proxy::TFTP::Pxegrub", obj.class.name
-  end
-
   def test_instantiate_pxegrub2
     obj = app.helpers.instantiate "pxegrub2", "AA:BB:CC:DD:EE:FF"
     assert_equal "Proxy::TFTP::Pxegrub2", obj.class.name

test/tftp/tftp_server_test.rb

@@ -102,16 +102,6 @@ def setup_paths
   end
 end
 
-class TftpPxegrubServerTest < Test::Unit::TestCase
-  include TftpGenericServerSuite
-
-  def setup_paths
-    @subject = Proxy::TFTP::Pxegrub.new
-    @pxe_config_files = ["grub/menu.lst.01AABBCCDDEEFF", "grub/01-AA-BB-CC-DD-EE-FF"]
-    @pxe_default_files = ["grub/menu.lst", "grub/efidefault"]
-  end
-end
-
 class TftpPxegrub2ServerTest < Test::Unit::TestCase
   include TftpGenericServerSuite