Disable Roubocop for heroku_clear_tasks file

Author: schneems

lib/language_pack/test/rails2.rb

@@ -36,6 +36,7 @@ def db_test_tasks_to_clear
   def clear_db_test_tasks
     FileUtils::mkdir_p 'lib/tasks'
     File.open("lib/tasks/heroku_clear_tasks.rake", "w") do |file|
+      file.puts "# rubocop:disable all"
       content = db_test_tasks_to_clear.map do |task_name|
         <<-FILE
 Rake::Task['#{task_name}'].clear
@@ -44,6 +45,7 @@ def clear_db_test_tasks
 FILE
       end.join("\n")
       file.print content
+      file.puts "# rubocop:enable all"
     end
   end