Allow to cancel connect() operations when using io_uring #237
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Motivation:
Whe using io_uring we can in fact cancel a connect() operation by just closing the underyling fd.
Modifications:
Don't mark the promise as uncancellable before issue the non-blocking connect() call Add comment to explain code
Result:
Related to netty/netty#13843 and netty/netty#13849