Comment 9 for bug 1723191

Reviewed: https://review.opencontrail.org/36881
Committed: http://github.com/Juniper/contrail-controller/commit/2e8d2639c8b28b41896ae8edcdadc9888f9d742e
Submitter: Zuul (<email address hidden>)
Branch: R4.0

commit 2e8d2639c8b28b41896ae8edcdadc9888f9d742e
Author: Suresh Venkata <email address hidden>
Date: Thu Oct 26 13:48:00 2017 -0700

reduce number of keystone interactions on a neutron call

Description: A neutron call transforms to multiple api calls.
In addition to authenticating relayed neutron call from plugin,
each individual api calls are subjected to keystone authentication
slowing the overall response time of neutron call.
This change tracks the authentication credentials of the first call
and reuses them for the subsequent calls.
GET requests go through localvncapi. So, only for those calls,
this change is applicable. Once all other requests go through
localvncapi server, it can be applicable for them also.

Change-Id: I286a7b8b13963f788343c924e53f1be0a0e157db
Closes-Bug: #1723191