Tokens in Security Guide

[Pete Forsberg]

This bug tracker is for errors with the documentation, use the following as a template and remove or add fields as you see fit. Convert [ ] into [x] to check boxes:

- [X] This doc is inaccurate in this way: According to the release notes for Pike, UUID is being deprecated. This documentation should be updated to reflect this.

https://docs.openstack.org/releasenotes/keystone/pike.html#deprecation-notes

- [ ] This is a doc addition request.
- [ ] I have a fix to the document that I can paste below including example: input and output.

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-----------------------------------
Release: on 2017-11-16 07:27
SHA: 7eaeba07587036b572f5ecd4d7b6bd5708b3af68
Source: https://git.openstack.org/cgit/openstack/security-doc/tree/doc/source/identity/tokens.rst
URL: https://docs.openstack.org/security-guide/identity/tokens.html

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/531101
Committed: https://git.openstack.org/cgit/openstack/security-doc/commit/?id=fcd68808af92bdf8444b62da96140378a1a4bc05
Submitter: Zuul
Branch: master

commit fcd68808af92bdf8444b62da96140378a1a4bc05
Author: Jeremy Liu <email address hidden>
Date: Thu Jan 4 15:38:51 2018 +0800

    Update identity/tokens section in security-guide

    - add link to release notes that mentions uuid token is being deprecated
    - fernet token is the default token provider in Identity service

    Change-Id: I2acf01a77a27c1b0fb72a5bd78a38f8b0e83e16c
    Closes-bug: #1734992