[HTTPConnectionPool] Fix request timer scheduling #438
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Motivation
If the allocator puts a request at the same address where another request has lived before and we ran into a timer race before, we run into an assertion. This can be seen in test runs here:
https://ci.swiftserver.group/job/async-http-client-swift55-prb/137/console
Changes
timerLock
fromHTTPConnectionPool
Result