intermittent failure of ITestS3AContractRootDir.testRmEmptyRootDirNonRecursive surfacing in
HADOOP-12774 test run.
This is a test which came in with
HADOOP-12977, one test which deletes all children of the root dir, then verifies that they are gone. Although it tested happily during development, the sightings of two transient failures before it worked implied that it's either got some race condition with previous tests and/or maven build, or we are seeing listing inconsistency.