Bug fix: handleLLDP() method uses incorrect port variable when getting the state of the packet-in port.

Bug fix: prevCluster assignment is changed to reflect the L2 domain ID of the prev entity.  It was possible for cur and prev to be swapped when duplicate attachment points were detected, where the prevCluster could have the wrong assignment.

Correct the set/get of TOS bits in OFMatch. The 6-bits of DSCP need to be top 6-bits of the network ToS byte.

Add a unit test that makes sure an exception is thrown when someone tries to remove a switch from the active switch map.

BSC-2116

BSC-2116

Change OFPacketIn.MINIMUM_LENGTH from an int to a short. OFPacketIn.setTotalLength() expects a short.

During flow reconciliation, device manager should not call learnDeviceByEntity, which would incorrectly update timestamps of entities existing in flow cache. It should call findDeviceByEntity instead.

If we cannot find an entity in the primary index we need to
classify it into an IEntityClass and the search in the class index.

* Fixed couple of bugs in Device.getIPv4Addresses().
* Add more debugging output to DeviceManagerImpl

* implement findDestDeviveByEntity()
* findDevice() and findDestDevice() will now throw an exception of the
  supplied fields are not sufficient for the lookup
* test and comment polishing
* reorganizing testing code

[BSC-1838]

(These icons were designed from scratch by me with ASL 2.0 license.)
Nodes are now labeled with their name (DPID or IP+MAC).
Added a hack to ignore multiple attachment points for hosts, since
Floodlight's concept of attachment points doesn't correspond to the
physical topology.

and associated javadocs

[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.