Update to attachment point flapping logic.  Use active time instead of last seen to order the entities.  Corresponding changes to unit tests.

1 - Unit tests
2 - REST API
3 - Handle multicast/broadcast

DeviceManager update to take into account that previous attachment belongs to non-broadcast domain attachment point.
Adding an interface to ITopologyService that indicates if tunnels are enabled for traffic between two hosts.

Update device manager to handle consistent attachment points to properly handle duplicate device flagging.

Send role request to switches when controller role changes if we
don't know yet if switch support the role request messages. This handles
the case where the switch connected to the controller before the
controller role had been set/enabled and thus we never sent out the
initial role request probe to the switch during the initial handshake.

Add support for __startswith parameters when querying for device information.  Some minor refactoring