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replication_test's state machine is not commutative, so if commands are applied in different order the states will be different as well. Since the preemption check was added into co_await in seastar even waiting for a ready future can preempt which will cause reordering of simultaneously submitted entries in debug mode. For a long time we tried to keep entries submission parallel in the test, but with the above seastar change it is no longer possible to maintain it without changing the state machine to be commutative. The patch changes the test to submit entries one by one. Message-Id: <20210117095147.GA733394@scylladb.com>