This is a utility class for various DataTreeCandidate-related
operations. One of them is a method to transform a NormalizedNode into a
DataTreeCandidate which behaves as if that node was freshly written into
an empty DataTree.
Change-Id: Id8126a68f3bf35092bd8630358eb258d65c61d36 Signed-off-by: Robert Varga <rovarga@cisco.com>