Comment 6 for bug 1379481

Reviewed: https://review.opencontrail.org/5648
Committed: http://github.org/Juniper/contrail-controller/commit/5b13a693aa86ae781958ad5eddf6d347ce6b0290
Submitter: Zuul
Branch: R1.10

commit 5b13a693aa86ae781958ad5eddf6d347ce6b0290
Author: Naveen N <email address hidden>
Date: Tue Dec 9 03:17:48 2014 -0800

* Path preference change was enqueued every time, interface config
change and hence, preference would be overwritten, because of this.
Removed the code to enqueue explicit path preference change.
Instead copy config driven field in local vm add change path.
Added test case for same.
Closes-bug:#1379481

(cherry picked from commit cfde6909bd93b91851e4cbcfcd507c5f3bd83b9b)

Conflicts:
 src/vnsw/agent/oper/vm_interface.cc
Change-Id: Idb9c5eab91ed20c6119d21bae05462bc5c7744c9