Support Extended JSON Schema in GenerateDS

[Nachi Ueno]

In this commit, we add extended JSON Schema support for Contrail Generate DS
for future migration for JSON Schema.

Support export JSON Schema + Ifmap and XML type information.
Support convert JSON Schema to XML Schema.

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/36919
Submitter: Nachi Ueno (<email address hidden>)

[Krzysztof Klimonda (kklimonda)]

Is there a blueprint, or some spec that describes why are we migrating to the JSON Schema? Could that be linked in the commit message and/or bug?

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/36919
Submitter: Nachi Ueno (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/36919
Committed: http://github.com/Juniper/contrail-generateDS/commit/00d410bfcbec2bdb6cd5cc509bdaf8a77f77e234
Submitter: Zuul (<email address hidden>)
Branch: master

commit 00d410bfcbec2bdb6cd5cc509bdaf8a77f77e234
Author: Nachi Ueno <email address hidden>
Date: Thu Oct 12 07:46:37 2017 -0700

Adding support for output contrail JSON Schema.
Contrail JSON Schema has JSON Schema + Data Model
information + IFMap information.
This commit also add utility to convert the Contrial JSON
schema to
XMLSchema using Jinja2.

Closes-Bug: 1729708
Change-Id: Ic9ff18741c807a91a016b864f0afa1b49f48788f