Search first graphnode from graphnodes in scope

1. Fix function that searches first graphnode to use the current scope
2. Add temporary testcase - this needs to be as short as possible
Complex assoc update test
Merge branch 'master' of https://github.com/DynamoDS/Dynamo into AssocUpdateFix
Refactor util function and test

1. Move function to associative engine utils
2. Remove redundant test
3. Rename complex test
Refactor complex testcases

1. Update testcase results
2. Set test category and defect
Merge pull request #2306 from junmendoza/AssocUpdateFix

Assoc update cleanup and added testcases