Improve TLS error messages and cancellation forwarding during TLS handshake after TCP/IP connection #177
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This PR improves TLS error messages (if connector fails due to TLS handshake errors) and improves (fixes) cancellation forwarding after the TCP/IP connection. This ensures that cancelling a pending connection attempt will properly cancel the underlying TCP/IP connection attempt and/or the TLS handshake.
The cancellation forwarding will eventually also be addressed upstream via reactphp/promise#99, but it's currently not decided when this version will be tagged. In the meantime, this PR works around this issue and improves cancellation semantics somewhat.
Refs #168, #169, #170, #171 and #176