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semaphore_timed_out errors should be ignored, similar to rpc::timeout_error or seastar::timed_out_error, so that they eventually be converted to `read_timeout_exception` via the data/digest read resolver on_timeout() method. Otherwise, the semaphore timeout is mistranslated to read_failure_exception, via on_error(). Note that originally the intention was to change the exception thrown by the reader_concurrency_semaphore expiry_handler, but there are already several places in the code that catch and handle the semaphore_timed_out exception that would need to be changed, increasing the risk in this change. Fixes #8958 Test: unit(dev) Signed-off-by: Benny Halevy <bhalevy@scylladb.com> Message-Id: <20210708083252.1934651-2-bhalevy@scylladb.com>