* IEntityClassifier only returns a single entity class per entity and all
  entities of a device must belong to the same entity class. Semantics for
  multiple classes was unclear.

* IEntityClassifier is now an IFloodlightService to have a cleaner way of
  setting the classifier to use (the classifier needs to be set before
  DeviceManager.startUp() is called).

[BSC-1838]

Unit tests for the parts of device manager that should be working, and some effort at fixing compile errors in other modules