Repeat test until callback invoked on IO thread.#669
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Very rarely the callback in
should_fail_when_synchronous_call_on_io_threadcould be registered after thesession.executeAsyncfuture completes, causing it to be executed on the same thread. In this case we simply retry until we know the callback is executed on an io thread. If this doesn't happen in 1000 attempts, the test fails.