message: Remove old flag
diff: @@ -92,11 +92,6 @@ flags.DEFINE_string(
  'Flag value must be a full path to the "tests" directory, which is usually'
  ' $(realpath ./tests). A failed tests counts the same as a failed build.'))
  -flags.DEFINE_string(
  - 'write_tags_to', None,
  - 'Write the list of tagged images to a file. Useful for parallelizing tests.'
  -)
  -
  flags.DEFINE_boolean(
  'stop_on_failure', False,
  ('Stop processing tags if any one build fails. If False or not specified, '
  