Add more INI options to control OpenSSL verification

### Description

Currently OpenSSL offers `openssl.cafile` and `openssl.capath`. In some cases it seems useful to control other  verification like `allow_self_signed`.

This is related to the bug report https://bugs.php.net/bug.php?id=69319 which proposed `stream_context_set_default` but that's not possible due to BC impact and also does not make always sense from the logic point of view.