Fix unit tests for Wikia CE nodes (includes some minor refactoring of ve.ce.GeneratedContentNode).
Fix ve.ce.ContentBranchNode tests (setup is not called for ve.ce.GeneratedContentNode anymore).
Better naming of variables
Revert debugging comments in test cases
Merge pull request #2557 from Wikia/ve-fix-ce-nodes

VE-770: fix VE unit tests for CE nodes