Adding/deleting SI in chain results in traffic loss.
Adding/deleting SI in chain results in traffic loss.

Problem:
While re-evaluating flow/rflow the old reverse flow of flow/rflow were not
pointing to same(pointing to NULL) and hence were marked as short flow,
but same was not updated to stats_collector. This resulted in flow dangling till
aging and in turn holding respective VRF in deleted state. Afet aging VRF was
removed and new VRF added, in turn restoring traffic.

Solution:
Notify stats collector on marking as short flow.

(cherry picked from commit 74e0dff2e00ffdf55cdbfbcbe74544e169453daf)
Closes-bug: 1549454
Change-Id: Ibfac8308002e1f91bd423426b771d699fc9bb3f4

codilime/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,codilime/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller