Add an interface method to ITopologyService to get all the switches in the same openflow domain as a given switch id.

Adjustment to attachment point logic.  If a device is learnt on OFPP_LOCAL of a switch, it will stay in that port until the switch is removed or the port goes down.  The attachment point of the device cannot be modified from OFPP_LOCAL, once assigned.

When injecting fake ARP: set sender IP to 0 (ARP probe)
Remove weird IP learning on DHCP-replies:
	WILL BREAK DHCP MANAGER WITH RELAYS

This is a short-term. In the long run we actually do want to prevent
learning on these ports.

BSC-2836

BSC-2837: When returning early from learnDeviceByEntity: process
	deleteQueue
BSC-2836: Do not learn entities on internal ports
BSC-2834: Some device updates get queued before check for concurrent
	modification
BSC-2824: Remove potential incorrect Corrupted Device Index exception

 * use insertion sort when adding entity to device
 * precompute Device.getVlandId() return value

This change is mostly for streamlining and clarifying IDeviceServiceAPI.
* renamed findDestDevice to findClassDevice
* pass an entityClass to findClassDevice instead of the
  "source"/"reference" device.

- event processing in cleanupEntities was exiting prematurely, some device delete
  updates were not being processed
- updated unittest to verify device deletion
- See BSC-2454

Bug fix: Whenever a device with new entity was created that causes a change in attachment point, deviceMoved notification should be sent after the indices are updated.

Update to attachment point logic. NewAP is always given preference if it is not broadcast domain port and its active time is later than oldAP.

Rewrite of reclassify, made learnDeviceByEntity the only place where devices get created or updated (through re-allocation).

Changes to classState map to use IEntityClass name as key now. Also debug logs sprayed around some methods for more visibility if required while debugging.

Update to attachment point comptuation to flag devices flapping between two switch ports.  Enable duplicate mac unit tests.

Reclassify all devices that belong to changed entityclasses or null entity class. And also some fixes to prevent race conditions.

When deleting or allocating a device as a part of reclassify update the device map, primary and class indices to reflect this change.

Reclassify devices in entityClassChanged only for devices that belong to entity classes that got changed.

FL-81 - Don't trust the buffer ID of the PacketIn if the switch has 0 buffers according to it's features reply.

method to delete a device removing all entities, updating secondary map indices first and then delete from devicemap.

BSC-2131

Send port status update from link discovery manager whenever a port status MODIFY message is received. Minor changes to printing of link discovery updates and addition of some trace logs.