Implement tests to expose sequencing bugs #180
                
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Regarding the addition of a
sleeptoaccept_one:This is used by the
test_accept_partial_read_sequential_requeststest to make it easier to reproduce the problem. Hopefully you agree that such a delay could naturally occur in a complex program given the surrounding async operations, and that if introducing a delay here causes a problem, then the code already had a bug. If not, then ignore that test.Identical tests have been added to #179 to show that it fixes these issues.