OpenSSL streams liveness check should be always non blocking

Description

Currently all OpenSSL streams use TCP connection. There is no point for liveness check to ever use timeout and it makes the check with and without timeout inconsistent because if it's used without timeout (which is always the case for internal PHP function like php_stream_eof), then it succeed even if no data is read - it fails only if there is an error - this is especially important for non blocking mode. However if it's used with timeout and the timeout expires, it return false. There does not seem much advantage to do that and considering that it is unused and it makes the code significantly more complex, we should remove this handling and always return immediately.

定位 OpenSSL stream liveness-check 的实现，并检查如何处理 timeout 和 non-blocking 路径。当检查能够在不进行 timeout 处理的情况下立即返回，同时保留文档所述的错误和 non-blocking stream 行为时，工作即告完成；如果 repository 提供相关的 stream 测试，请找出或运行这些测试。