Comment 14 for bug 1716881

Reviewed: https://review.opencontrail.org/35701
Committed: http://github.com/Juniper/contrail-controller/commit/2af08a8f54e289526479cba7ab413a7ee838e8c1
Submitter: Zuul (<email address hidden>)
Branch: R3.2

commit 2af08a8f54e289526479cba7ab413a7ee838e8c1
Author: Yuvaraja Mariappan <email address hidden>
Date: Mon Sep 18 17:45:28 2017 -0700

Fixed service-instance delete issue

During the loadbalancer delete, If the instance ip
is removed before the service instance, the evalute of
service instance would call the create_service_instance()
which would do the chown/update for the instance_ip which
may not be there which would cause this error.

Added exception handler to handle this.

Change-Id: I7688b8818f4b68c117ebc024d192fa3f2b4454fb
Closes-bug: #1716881