Removing redundant cfilt fields.
Merge pull request #12 from rajreddy/async

Removing redundant cfilt fields.
Merge pull request #11 from vishnuvv/Underlay

Did following changes,
Did following changes
    1)Added the flag based on which the topology changes will be displayed in UI
    2)Added the direction column in the trace flow grid and picking vrouter ip based on the direction and some minor bug fixes

Change-Id: I4c79840889edc2fe4be98367148a2c5ea787afed