Bro::Redis - Redis log writer (dynamic, version 1.0)
    [Writer] Redis (Log::WRITER_REDIS)
    [Constant] Redis::server_host
    [Constant] Redis::unix_path
    [Constant] Redis::server_port
    [Constant] Redis::db
    [Constant] Redis::key_prefix
    [Constant] Redis::key_index
    [Constant] Redis::json_timestamps
    [Constant] Redis::flush_period
    [Constant] Redis::key_expire

