message: Make delegate options compatible with python3.
diff: @@ -99,8 +99,8 @@ class Delegate(object):
  options_keys = (ctypes.c_char_p * len(options))()
  options_values = (ctypes.c_char_p * len(options))()
  for idx, (key, value) in enumerate(options.items()):
  - options_keys[idx] = str(key)
  - options_values[idx] = str(value)
  + options_keys[idx] = str(key).encode('utf-8')
  + options_values[idx] = str(value).encode('utf-8')
  class ErrorMessageCapture(object):
  