Comment 2 for bug 140484

Reviewed: https://review.opencontrail.org/5849
Committed: http://github.org/Juniper/contrail-controller/commit/b7e1392ccbdd3e898850161fe22ed5dbc3c4d34f
Submitter: Zuul
Branch: R2.0

commit b7e1392ccbdd3e898850161fe22ed5dbc3c4d34f
Author: Naveen N <email address hidden>
Date: Mon Dec 22 06:04:42 2014 -0800

* If there are more than 3 ecmp instance in same compute node and
transition happens from non-ecmp to ecmp either due to active-active
flag change or delay in instance-ip link being processed in oper DB,
then when the first instance path change is being processed, there
would already be 3 path, and logic expects ecmp peer path to be
already present in that case, hence assert.
Changed to login to count path with ecmp flag set only.
Added a test case for the same, earlier test case used to verify
only ecmp transition when there are 2 service instance.
Closes-bug:#140484

Change-Id: I38fcc78405ea7ac557b825951d95b497b5389d49