Close-Bug:#1402371. This is an enhancement bug to address starting of contrail-hamon on getting the event on file system startup

Change-Id: Ia3c69de77a0a53ba92c2b379aff5b4a542ff0e2d
Merge "Close-Bug:#1402371. This is an enhancement bug to address starting of contrail-hamon on getting the event on file system startup" into R2.0