Fix the return value of Cluster.findTopicPartitionMetadata #749
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The return value is not an Object, but an Array (of PartitionMetadata objects). This also means we can
simply check the number of entries and don't need to calculate the keys when sending messages.
Note that this exposed a bunch of problems in the tests as well: the mocked calls not just returned the
wrong type, but in fact returned a completely unrelated value.