After a bundle split, perform the unload in background #7387
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Motivation
After a bundle is split by the load manager, by default we also attempt to unload the 2 newly created bundles halves.
Currently the unload is performed sequentially after the split and it will be keeping the split operation pending until is completed.
In reality, this is not necessary, because the unload is only done as a best effort to quickly spread the load to other brokers, once the the bundle is split. This operation can be safely done in background.