Add partial flushing integration test case #78
Description
@brettlangdon had a good example of a trace that we should be testing with: https://github.com/DataDog/dd-apm-test-agent/pull/77/files#r883908427
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@brettlangdon had a good example of a trace that we should be testing with: https://github.com/DataDog/dd-apm-test-agent/pull/77/files#r883908427