Improve the stability of preserve ordering test in L0_batcher #4117
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This PR fixes the intermittent failure on L0_batcher preserve ordering subtest.
Notice how just capturing the timestamp just before:
Fixes the issue. Using HTTP_SEND_START itself did not fix the issue. Need to study libevhttp library to figure out why the order gets broken.
With INFER_RESPONSE_COMPLETE trace point the order is as expected.