JmsIO should create an unique source in case of topic

The JmsIO deals with both queue and topic.

Currently, we create multiple sources depending of the desired number of splits.
If this behavior is correct when using a queue (we have concurrent consumers of the queue), it's basically wrong when using a topic (we have multiple subscribers, so potentially duplicated message).

When using a topic, the JmsIO should use an unique source (to avoid messages duplication).