KAFKA-10308: Fix flaky core/round_trip_fault_test.py (#9079)
Creating a topic may fail (due to timeout) in running system tests. However, `RoundTripWorker` does not ignore `TopicExistsException` which makes `round_trip_fault_test.py` be a flaky one. More specifically, a network exception can cause the `CreateTopics` request to reach Kafka but Trogdor retry it and hit a `TopicAlreadyExists` exception on the retry, failing the test. Reviewers: Ismael Juma <ismael@juma.me.uk>
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