Add isTunnelPort() to ILinkDiscoveryService.  A tunnel port is not an attachment point port even if no links are found through it.

BDDP packets are now transmitted with BSN Eth-type. Minor refactoring of the code inclues: (1) Removal of BDDP class; (2) Using LLDP encapsulated inside BSN header for BDDP functionality.

Changes to autoportfast working.  Quarantining a fast port does not depend on whether the autoportfast feature is enabled or not.

Rename isLLDPSuppressed to isLinkDiscoverySuppressed.  Rewrite of autoPortFast feature and how the ports are added to quarantine and maintenance.

Introducing rate control in sending BDDP messages, quarantining ports as they join the network, change API getEnabledPorts().

rename writeLink to writeLinkToStorage.  Make these methods protected so others can extend them if needed.

Bugfix: floodlightProvider.getRole() returns null if the HA role is not enabled.  Discovery task schedule/reschedule should include null as a possible setting for role.

Rechedule discovery task only if role is MASTER.  Also, start the scheduling when role is changed to master.

Rechedule discovery task only if role is MASTER.  Also, start the scheduling when role is changed to master.

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.

Updates to attachment point learning and udpating.  DeviceManager listens to topologyChanged() events.  Whenever a port goes down or a switch is removed, attachment points are updated.  Cleanup of link discovery manager updates; cleanup also includes port up/down switch update/removed messages.

Rewrite of attachment point logic.  Attachmetn points are maintained independent of entities.  Update test cases.  Duplicate Mac test is disabled for the time being.