as the left-most columns

o show openflow cluster count with/without tunnels
o show external port count for each external cluster

1) new event for BVS Interface(s) assigned
2) new EventFieldTypes for LIST_OBJECT, SREF_OBJECT and SREF_LIST_OBJECT
3) removing LIST_VLAN from EventFieldType as it is superseded by LIST_OBJECT

[BVS-420] Add unit tests for checking if device moved notifications are sent or not under certain situations.

The previous fix is not correct.  The fix generates a device moved event when the attachment points are not even updated.

Revert "Device moved notification has to be generated when the new attachment point was already in the oldAP list."

This reverts commit 2d6a75c4116790db7d1ddaa53e0d6d873d035815.

or explicitly ingore it if it's safe

add null check for getLinkInfo return value

so the user does not have to check floodlight logs for them.

(the actual files have been moved a while ago, I just missed the unit
tests)

Guess I was wrong. Unit tests *were* broken

* New state-machine for non-IVS switches is unit tested
* No unit tests for IVS switches yet