* Make all fields final or volatile
* Still not 100% safe (visibility): lastSeenTimestamp of the entities
  can be changed unsynchronized

 	Fix warnings  (https://github.com/bigswitch/bigswitchcontroller/pull/3312)

Includes framework for creating events and managing memory for events via
thread local stores and global circular buffers per registered event.
Also includes a basic rest api call to retrieve event history.
Unit tests have been added

* make sure we do things in the right order (setting role, sending role reqs)
* fix getName() in HAListener's
* transition AddressSpaceManager before DeviceManager to Master
* flush counters from threads
* add trace logging and more counters

Fix NPE in deleteLinks() during keysModified() on Slave Node (https://github.com/bigswitch/bigswitchcontroller/pull/3307)

Debug Counters related to SyncStore for BigLinkDiscovery (https://github.com/bigswitch/bigswitchcontroller/pull/3287)

moved json property declaration to variable decalartion

also remove custom serializers for switch, port variables

Fix possible sending ofsyncvalue messages without any values (https://github.com/bigswitch/bigswitchcontroller/pull/3286)

Updates to link discovery based on switch state and notification changes. (https://github.com/bigswitch/bigswitchcontroller/pull/3285)

Conflicts:
	floodlight/src/main/resources/floodlightdefault.properties

Change topologyChanged() method signature to provide an unmodifiable list of applied updates during the method call.

Still needs more work:
 * we don't generate updates if a stored switch has changed yet
 * we don't deal with (unlikely) change of port name <-> number

BVS known devices for sync and small change for SwitchPort (https://github.com/bigswitch/bigswitchcontroller/pull/3271)

flow reconcile engine - cleanup and minor fixes (https://github.com/bigswitch/bigswitchcontroller/pull/3270)