* When a flow transition happens from non ecmp to ecmp, forward flow
  and reverse flow have to be linked for RPF verification. Reverse flow's
  binding to forward flow was not programmed by agent since in ksync
  we wernt checking for ecmp flag change, and since all other fields would be same
  agent was not linking reverse flow to forward flow. Checking if ecmp flag has changed
  and forcing kernel programming
(cherry picked from commit 42259e3a5e4e5908e38139180fc67d12a5bf6d71)