[BSC-1838]

* 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]

2 - Fix some tabbing.

getRoute() method must provide the complete route from source port to destination port even when the route involves only one switch.  getRoute() must also not provide route from same switch-port to itself.

Refactoring Route class and getRoute() methods to maintain and provide a sequence of switch-ports, rather than links.  Update unit tests accordingly.

Link discovery manager must send LDUpdate when port status change message is received if it affects any links that is already known.

If a standard LLDP comes from a different network, we should drop it.  The standard LLDP mac address could be :00, :03, :0e.

Fixed missing paren in PythonServer

Display port name (ethN, brN, etc.) for OVS ports.
Cleaned up some more formatting.

2 - Fixed an issue in DeviceManagerImpl where it was sending updates with the old device.

(For some reason the switch list takes ~10s to load, and I'm running on
a monster server.)

Updated UI to match REST API changes.
Commented out references to VLANs since they're not implemented.
Fixed some more space/tab formatting.

Also fixed some tab/space formatting inconsistency.

Reverse the sequence of operations to do when a switch is added - first clear all flow mods and then dispatch switch added callbacks in dispatch thread. Else we have a race condition.

Updates to DeviceManagerImplTest corresponding to changes in attachment point computation using topology last changed time.