Sketch of #18.
Implementation.
Initial test that changestate returns a dict of lists
Placeholder docstring for a missing one found
Start of more realistic test with given config
An ugly start to implementation
Use model_from_configuration instead of private methods
Moved difference-finding logic into Deployer class
Fixed flake8 errors
Placeholders for tests for Change Node
Test for empty case of change_node_config
Typo.
Fix tests.
Merge forward.
More complete tests for change_node_config
Flake8 and TODOs
Clarified tests with docstrings and minor changes
Docstring test class
Start of test for no changes needed
Removed TODO