Two problems:
1. Get is always using Existing nodes slice, and you will for sure miss any
   updated data
2. Each Update duplicates node entry in UpdatedNodes slice

For the 1st, try to find a node in UpdatedNodes slice (same as for the List).
2nd - append only if there is no node with same name as updated, if there is
just replace object.

Change-Id: I9ef1cca2788ba946eee37fa1b037c124ad76074c