Reduce logging noise

- No longer list Attract's RNA classes, these haven't changed in a long
  time and it's not interesting to see.
- Reduced log level when updating internal state. The result of the update
  is already logged at INFO level.

blender_cloud/attract/__init__.py

@@ -1007,7 +1007,6 @@ def deactivate():
 
 _rna_classes = [cls for cls in locals().values()
                 if isinstance(cls, type) and cls.__name__.startswith('ATTRACT')]
-log.info('RNA classes:\n%s', '\n'.join([repr(cls) for cls in _rna_classes]))
 
 
 def register():