Fixes for ClickHouse

[azat]

Changes

• Fix calling wait_io_or_timeout() (pass is_read properly for writes) #15
• Check SSL_get_error() on SSL_read() when returns 0 (like man says) #16
• Fix usage of wait_io_or_timeout from TLS layers #17

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✅ azat
❌ 9EOR9
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