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.

OpenSSL の stream liveness-check 実装を見つけ、timeout パスと non-blocking パスがどのように処理されているかを確認してください。エラーおよび non-blocking stream に対する文書化された動作を維持しながら、チェックが timeout 処理なしで直ちに返るようになれば作業は完了です。リポジトリに該当する stream テストが用意されている場合は、それらを特定するか実行してください。