Fixes standard TensorBoard CLI flags to parser.

def fix_flags(self, flags):
    """Fixes standard TensorBoard CLI flags to parser."""
    FlagsError = base_plugin.FlagsError
    if flags.version_tb:
      pass
    elif flags.inspect:
      if flags.logdir and flags.event_file:
        raise FlagsError(
            'Must specify either --logdir or --event_file, but not both.')
      if not (flags.logdir or flags.event_file):
        raise FlagsError('Must specify either --logdir or --event_file.')
    elif not flags.db and not flags.logdir:
      raise FlagsError('A logdir or db must be specified. '
                       'For example `tensorboard --logdir mylogdir` '
                       'or `tensorboard --db sqlite:~/.tensorboard.db`. '
                       'Run `tensorboard --helpfull` for details and examples.')

    if flags.path_prefix.endswith('/'):
      flags.path_prefix = flags.path_prefix[:-1]