Comment 7 for bug 1547645

Reviewed: https://review.opencontrail.org/17556
Committed: http://github.org/Juniper/contrail-controller/commit/554bb1ca34ea798f5a57ecc0266414e9aa3f9c2c
Submitter: Zuul
Branch: R2.22.x

commit 554bb1ca34ea798f5a57ecc0266414e9aa3f9c2c
Author: varun_lodaya <email address hidden>
Date: Mon Feb 22 10:00:06 2016 -0800

Fix to support multiple cert managers with LBaaS

This fix allows users to be able to use differet cert managers
with LBaaS custom attributes. It adds a Generic Cert Manager to
the code which can copy files from a specific folder.
Adding metaclass to cert_manager.
It also fixes the crt file name from generic to instance specific
to support multiple certs under the same folder.
Modified log formatter to provide file/line_nos.
Also, added few unittests to custom attribute code.
Closes-Bug: #1547645

Change-Id: I65cef1690cad6bad229e176615e18cad246334eb