Update to attachment point flapping logic.

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

Change domain based hash to switch based hash (https://github.com/floodlight/floodlight/pull/146)

Floodlight VirtualNetworkFilter. (https://github.com/floodlight/floodlight/pull/145)

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

Minor improvements to link discovery and forwardingbase (https://github.com/floodlight/floodlight/pull/144)

Use lower case project name since people on weird systems like MacOS … (https://github.com/floodlight/floodlight/pull/143)

Use lower case project name since people on weird systems like MacOS … (https://github.com/floodlight/floodlight/pull/143)

topology changes (https://github.com/floodlight/floodlight/pull/142)

Add flow cache interfaces (https://github.com/floodlight/floodlight/pull/141)

    topology ui: more error checking  (https://github.com/floodlight/floodlight/pull/137)

Add attachment point and link discovery suppression (https://github.com/floodlight/floodlight/pull/138)

still finding links with undefined references

this is a bandaid fix for Interop -- need to rewrite

Topology changes. (https://github.com/floodlight/floodlight/pull/136)

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.