…ncellation (boostorg#321) * Adds support for terminal and partial cancellation to async_run. * Makes basic_connection::cancel use per-operation cancellation under the hood. * Fixes a number of race conditions during cancellation which could cause the cancellation to be ignored. This could happen if the cancellation is delivered while an async handler is pending execution. * Deprecates operation::{resolve, connect, ssl_handshake, reconnection, health_check}, in favor of operation::run. Calling basic_connection::cancel with these values (excepting reconnection) is now equivalent to using operation::run. * Fixes a problem in the health checker that caused ping timeouts to be reported as cancellations. * Sanitizes how the parallel group computes its final error code. * Simplifies the reader, writer and health checker to not care about connection cancellation. This is now the responsibility of the parallel group. * Removes an unnecessary setup_cancellation action in the reader FSM. * Adds documentation regarding per-operation cancellation to async_receive. * Adds additional health checker tests. * Adds async_run per-operation cancellation tests. * Adds reader FSM cancellation tests. * Makes test_conn_exec_retry tests more resilient. * Removes leftovers in the UNIX and TLS reconnection tests. These were required due to race conditions that have already been fixed. close boostorg#318 close boostorg#319

Support per-operation cancellation in async_run #319

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