remove unnecessary registerSerialization about TransactionAttempt because we will register the class in the SerializationFactory

[hustfxj]

very minor.

[satishd]

+1

[hustfxj]

we register the class "org.apache.storm.transactional.TransactionAttempt" in SerializationFactory , But we register the class "org.apache.storm.trident.topology.TransactionAttempt" in MasterBatchCoordinator. So it will occur serialization errors when we run trident topology. Do you Think ? @revans2@satishd

[satishd]

@hustfxj That was a good catch. We may need to keep org.apache.storm.trident.topology.TransactionAttempt registered as it is serialized/deserialized over the wire in trident topologies.