Automatic merge from submit-queue

Fix FakeNodeHandler Update behaviour

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

For the 1st, we will 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 we will replace object in UpdatedNodes slice.