Reorder Data spawning and finalizing in the listener
Reorder Data spawning and finalizing in the listener

Some events are fired when Data objects get their DONE status, and
these events already need to see spawned children. This commit reorders
operations in the Resolwe listener so that spawning doesn't happen after
finalising anymore.

genialis/resolwe,genialis/resolwe,jberci/resolwe,jberci/resolwe