* Go thru component NH list, and pick local component NH
  if there is no ecmp peer path or local ecmp mpls label.
* If a link to instance-ip is not present, retain previous
  known mode inline with ip-address.
* If flow transition from non-ecmp to ecmp trap the forward flow
* Test case for same added
Closes-bug: #1364908
Change-Id: I996a1492903cd56a1f5f193e11aa7b94af1a53da