'Try to get a setting from (in order):
TestEnvironment.config, the os env, or some default (if not False).'

def _get_setting_from_config_or_env(self, config_name, env_name, default=None):

    config_val = self.config.get(config_name, None)
    env_val = os.environ.get(env_name, None)
    return (config_val or env_val or default)
