FIX: ensure we can download maxmind without redis or db config

This also corrects FileHelper.download so it supports "follow_redirect"
correctly (it used to always follow 1 redirect) and adds a `validate_url`
param that will bypass all uri validation if set to false (default is true)

script/import_scripts/phpbb3/importers/avatar_importer.rb

@@ -70,7 +70,8 @@ module ImportScripts::PhpBB3
         avatar_file = FileHelper.download(
           url,
           max_file_size: max_image_size_kb,
-          tmp_file_name: 'discourse-avatar'
+          tmp_file_name: 'discourse-avatar',
+          follow_redirect: true
         )
       rescue StandardError => err
         warn "Error downloading avatar: #{err.message}. Skipping..."